National Public Lands Day VOLUNTEER Invitation

Tumacacori NATIONAL HISTORICAL PARK invites you to these two Family-Friendly Volunteer Events on

Saturday, September 25, 2021:

Goathead Attack Squad.

Time: 9am-11:00am

Bring closed-toe shoes, proper sun protection (long-sleeved shirt, sun hat, sunscreen, etc.), gloves, at least 2 liters of water for each person in your group.

Time: 1:pm-3:00pm

Weed Walk on the Anza Trail

Bring closed-toe shoes, proper sun protection (long-sleeved shirt, sun hat, sunscreen, etc.), gloves, at least 2 liters of water for each person in your group.


Tony Palmer

Tumacácori National Historical Park

Biological Science Technician


Wild Flowers 2021

Retired FOSCR Board Member Marty Jakle shares his wildflower expertise on this season’s wildflowers.

Marty Jakle, Member
Marty Jakle, Retired FOSCR Board Member

Wow.  This is the best monsoon season I’ve seen since I’ve lived in the area (15 years) and is one for the record books with 14 inches and counting.   Besides turning the area a vivid green, it has given rise to a bumper crop of wildflowers.

The most obvious wildflower is the Arizona Caltrop or monsoon poppy, (Kallstroemia grandiflora) which is not to be confused with the desert gold poppy; abundant here in the spring depending on rainfall. It is carpeting the land in a blanket of yellow flowers.   The monsoon poppy is always found during the monsoon season, especially along roadsides, but this year a banner year for the species.  The best year I’ve seen.

Another species which is having a similar season is the pink bottle brush, (Mimosa dysocarpa) whose flowers look like whitish/pinkish woolly worms at the ends of the shrub.  I commonly see it growing along the roadsides.

A species that I see more often this monsoon is the mala mujer, (Cnidoscolus stimulosus) a bizarre looking plant with small, white flowers and growing about 1 ft. tall.  It has spines all over it—on the stem, seed pods and even on the underside of its leaves.  The upper surface of the leaf has white spots making where the spines grow on the leaf’s underside.

The ubiquitous morning glory (Convolvulaceae sp.) is also having bumper year.  Like its name implies it blooms in the morning, shriveling up by noon.  It’s taking over my place—its fences, trees and anything it can climb on.  It reminds me a bit of the infamous kudzu vine that I would see on family vacations to Florida.  I’ve seen its funnel-shaped flowers colored the normal purple, but also white, pink, and lavender.

It’s cousin, the field bindweed, (Convolvulus arvensis) blooms later in the day and has the same colored & shaped flowers.

Here’s a tip for putting a name to many of the plants and animals you see.  A handy Free app for identifying them is “Seek”.  Download the app and using your phone camera, you scan what you want to I.D. and the name (hopefully) will appear on the screen.  It works by using artificial intelligence and compares your specimen with its vast memory bank.

Notice of Appeal and Request for Hearing

Before the Water Quality Appeals Board Department of Administration in and for the State of Arizona the Appellants (Listed below) filed a

Notice of Appeal and Request for Hearing

on the

Proposed Significant Amendment to Arizona Minerals Inc. Aquifer Protection Permit Inventory


Arizona Department of Environmental Quality (ADEQ)


  • Patagonia Area Resource Alliance
  • Defenders of Wildlife
  • Arizona Mining Reform Coalition
  • Borderlands Restoration Network
  • Center for Biological Diversity
  • Earthworks
  • Friends of the Santa Cruz River
  • Friends of Sonoita Creek
  • Save the Scenic Santa Ritas
  • Sky Island Alliance
  • Tucson Audubon Society

Summary and Conclusions

  1. All downstream aquifers, including those in Harshaw and Sonoita creek valleys, must be protected by a system of early-warning POCs (Point of Compliance) upgradient of the first drinking water well monitored on a Daily basis.
  2. POC-4 must be constructed, and baseline data collected for at least one full year prior to any large discharge from WTP2 to capture the range of natural variation in the system. This POC is important for tracking any changes in water quality that might result from the addition of 4500 gpm into Harshaw Creek, regardless of the compliance status of that discharge.
  3. Two additional POC monitoring wells should be installed between Outfall2 and the first shallow drinking water well in Harshaw Creek.
  4. EPA Secondary standards are critical for protecting the existing uses of Harshaw and Sonoita Creek aquifers. These aquifers are presently used without treatment except disinfection. Any additional load of sulfate, for example, may require local residents who depend on these sole-source aquifers to implement expensive treatment or seek a replacement (eg. bottled water) supply.
  5. AMI has not conducted a thorough and complete hydrologic study to assess the predicted impacts of pollutant releases on downstream drinking water aquifers. Am integrated hydrologic/hydraulic flow and fate/transport model should be used to assess the short-(hours to days) and long-term (months) nature and extent of pollutant release(s) at the Hermosa Property, as the surface and subsurface hydrologic system along Harshaw and Sonoita Creeks are strongly coupled. A much more rigorous hydrolooogic evaluation is needed, and a protection plan commensurate with those results must be developed.
  6. Compliance monitoring requirements should be consistent with AWQS and federal SDWA standards where they are stricter. Radionuclide monitoring should be required at all POCs, including Outfalls 1 and 2.

Trash along the Santa Cruz River

Community Clean-Up January 27th

Trash along the Santa Cruz River

Community Clean-up of a Big River-borne Trash Pile
Sponsored by Friends of the Santa Cruz River

WHEN: Saturday, January 27, 9 AM to 12:30 PM

WHERE: Behind the Tumacacori Mesquite Sawmill in Carmen, between Tubac and Tumacacori, #2007 East Frontage Road

DETAILS: wear long pants, sturdy shoes, gloves, hat. Bring a reusable water bottle please!Warning: uneven terrain and other possible hazards! Not suitable for small children. We will supply refill water, trash bags, gloves, “grabbers” and other equipment, snacks, safety training and coordination.

PARTNERS: Anza Trail Coalition, Arizona Department of Environmental Quality, Santa Cruz County, Tumacacori Mesquite Sawmill, and many caring individuals.

PARKING: You will be directed at the Mesquite Sawmill gates

CONTACT: Email us at foscriver @ if you plan to help out; please provide cell phone number too if you have one OR you can RSVP at our Facebook event page.

FOSCR Statement on the Recent Rupture of the IOI

Friends of the Santa Cruz River logo

Friends of the Santa Cruz River has been concerned for some time that the binational sewage pipe, the International Outfall Interceptor (IOI), could be breached by floods in the Nogales Wash under which it lies. A pipe break would spill raw sewage into the communities of Nogales, Rio Rico, Tubac and further north along the Santa Cruz River. Our warning is encapsulated in a short video we had made and started distributing earlier this year, called “Flirting With Disaster“.

We are sad to say this eventuality has now come to pass. The waters of the Wash and the Santa Cruz River into which it flows are now heavily contaminated. An easy fix is not in sight; and even when repairs to this breach are eventually made, there is a good likelihood that a similar disaster will happen again somewhere else along the 9-mile IOI, possibly even this summer.

Although the International Boundary and Water Commission (IBWC) has developed a plan to insert a resin sleeve into the existing IOI, and FOSCR supports this repair strategy, it will not solve the persistent problem of the location of the IOI.

This binational sewage pipe must be removed from the bed of the Wash if future public health disasters like this one are to be avoided in the future. IOI relocation will not come cheap or easy. However, barring a major overhaul of the entire Nogales Wash watershed (most of which is in Mexico), repeated erosive floods will inevitably threaten the IOI with rupture and thus threaten the health of all Santa Cruz County residents as well as the ecological health of the Santa Cruz River ecosystem. Furthermore, since most of Santa Cruz County’s residents depend for their drinking water on the aquifer that underlies the river, our drinking water supply also faces a long-term and significant threat from repeated discharges of contaminated water into the river.

This is a matter of true national security; if we don’t have clean drinking water and are not protected from public health threats, how secure are we? The IBWC must take responsibility for this border crisis and first, repair the IOI. But second and more importantly, they must get the IOI out of the Nogales Wash.

Lake Powell, by Patti Weeks

Climate change is shrinking the Colorado River

NOTE: This article is reposted from TheConversation.Com originally posted on June 13, 2017 10.22pm EDT. Read the original article with links to additional information at:

Lake Powell, by Patti Weeks
Lake Powell, photographed April 12, 2017. The white ‘bathtub ring’ at the cliff base indicates how much higher the lake reached at its peak, nearly 100 feet above the current level. Patti Weeks

The nation’s two largest reservoirs, Lake Mead on the Arizona/Nevada border and Lake Powell on the Arizona/Utah border, were brim full in the year 2000. Four short years later, they had lost enough water to supply California its legally apportioned share of Colorado River water for more than five years. Now, 17 years later, they still have not recovered.

This ongoing, unprecedented event threatens water supplies to Los Angeles, San Diego, Phoenix, Tucson, Denver, Salt Lake City, Albuquerque and some of the most productive agricultural lands anywhere in the world. It is critical to understand what is causing it so water managers can make realistic water use and conservation plans.

While overuse has played a part, a significant portion of the reservoir decline is due to an ongoing drought, which started in 2000 and has led to substantial reductions in river flows. Most droughts are caused by a lack of precipitation. However, our published research shows that about one-third of the flow decline was likely due to higher temperatures in the Colorado River’s Upper Basin, which result from climate change.

This distinction matters because climate change is causing long-term warming that will continue for centuries. As the current “hot drought” shows, climate change-induced warming has the potential to make all droughts more serious, turning what would have been modest droughts into severe ones, and severe ones into unprecedented ones.

How climate change reduces river flow

The Colorado River Basin (USGC)
The Colorado River is about 1,400 miles long and flows through seven U.S. states and into Mexico. The Upper Colorado River Basin supplies approximately 90 percent of the water for the entire basin. It originates as rain and snow in the Rocky and Wasatch mountains. –USGS

In our study, we found the period from 2000 to 2014 is the worst 15-year drought since 1906, when official flow measurements began. During these years, annual flows in the Colorado River averaged 19 percent below the 20th-century average.

During a similar 15-year drought in the 1950s, annual flows declined by 18 percent. But during that drought, the region was drier: rainfall decreased by about 6 percent, compared to 4.5 percent between 2000 and 2014. Why, then, is the recent drought the most severe on record?

The answer is simple: higher temperatures. From 2000 to 2014, temperatures in the Upper Basin, where most of the runoff that feeds the Colorado River is produced, were 1.6 degrees Fahrenheit higher than the 20th-century average. This is why we call this event a hot drought. High temperatures continued in 2015 and 2016, as did less-than-average flows. Runoff in 2017 is expected to be above average, but this will only modestly improve reservoir volumes.

High temperatures affect river levels in many ways. Coupled with earlier snow melt, they lead to a longer growing season, which means more days of water demand from plants. Higher temperatures also increase daily plant water use and evaporation from water bodies and soils. In sum, as it warms, the atmosphere draws more water, up to 4 percent more per degree Fahrenheit from all available sources, so less water flows into the river. These findings also apply to all semi-arid rivers in the American Southwest, especially the Rio Grande.

Lake Mead / Lake Powell volume fluctuations
The combined contents of the nation’s two largest reservoirs, Lake Mead and Lake Powell, since their initial fillings. The large decline since 2000 is shaded brown for 2000-2014, our 15-year study period, and pink for the continuing drought in 2015-2016. The loss was significantly influenced by record-setting temperatures, unlike a similar 15-year drought in the 1950s which was driven by a lack of precipitation. Bradley Udall, Author provided

A hotter, drier future

Knowing the relationship between warming and river flow, we can project how the Colorado will be affected by future climate change. Temperature projections from climate models are robust scientific findings based on well-tested physics. In the Colorado River Basin, temperatures are projected to warm by 5°F, compared to the 20th-century average, by midcentury in scenarios that assume either modest or high greenhouse gas emissions. By the end of this century, the region would be 9.5°F warmer if global greenhouse gas emissions are not reduced.

Using simple but strong relationships derived from hydrology models, which were buttressed by observations, we and our colleagues calculated how river flows are affected by higher temperatures. We found that Colorado River flows decline by about 4 percent per degree Fahrenheit increase, which is roughly the same amount as the increased atmospheric water vapor holding capacity discussed above. Thus, warming could reduce water flow in the Colorado by 20 percent or more below the 20th-century average by midcentury, and by as much as 40 percent by the end of the century. Emission reductions could ease the magnitude of warming by 2100 from 9.5°F to 6.5°F, which would reduce river flow by approximately 25 percent.

Large precipitation increases could counteract the declines that these all-but-certain future temperature increases will cause. But for that to happen, precipitation would have to increase by an average of 8 percent at midcentury and 15 percent by 2100.

The American Canal
The American Canal carries water from the Colorado River to farms in California’s Imperial Valley. Adam Dubrowa, FEMA/Wikipedia

On a year-in, year-out basis, these large increases would be substantial. The largest decade-long increases in precipitation in the 20th century were 8 percent. When such an increase occurred over 10 years in the Colorado Basin in the 1980s, it caused large-scale flooding that threatened the structural stability of Glen Canyon Dam, due to a spillway failure not unlike the recent collapse at California’s Oroville Dam.

For several reasons, we think these large precipitation increases will not occur. The Colorado River Basin and other areas around the globe at essentially the same latitudes, such as the Mediterranean region and areas of Chile, South Africa and Australia, are especially at risk for drying because they lie immediately poleward of the planet’s major deserts. These deserts are projected to stretch polewards as the climate warms. In the Colorado River basin, dry areas to the south are expected to encroach on some of the basin’s most productive snow and runoff areas.

Moreover, climate models do not agree on whether future precipitation in the Colorado Basin will increase or decrease, let alone by how much. Rain gauge measurements indicate that there has not been any significant long-term change in precipitation in the Upper Basin of the Colorado since 1896, which makes substantial increases in the future even more doubtful.

Megadroughts, which last anywhere from 20 to 50 years or more, provide yet another reason to avoid putting too much faith in precipitation increases. We know from tree-ring studies going back to A.D. 800 that megadroughts have occurred previously in the basin.

Several new studies indicate that with warmer temperatures, the likelihood of megadroughts skyrockets in the 21st century, to a point where the odds of one occurring are better than 80 percent. So while we might have periods with average or above-average precipitation, it also seems likely that we will have decades with less flow than normal.

Average Temperatures in the Southwest 2000–2015 (NOAA)
Average Temperatures in the Southwest 2000–2015 (NOAA)

Planning for lower flows

March of 2017 was the warmest March in Colorado history, with temperatures a stunning 8.8°F above normal. Snowpack and expected runoff declined substantially in the face of this record warmth. Clearly, climate change in the Colorado River Basin is here, it is serious and it requires multiple responses.

It takes years to implement new water agreements, so states, cities and major water users should start to plan now for significant temperature-induced flow declines. With the Southwest’s ample renewable energy resources and low costs for producing solar power, we can also lead the way in reducing greenhouse gas emissions, inducing other regions to do the same. Failing to act on climate change means accepting the very high risk that the Colorado River Basin will continue to dry up into the future.

This article was reposted from TheConversation.Com Read the entire article with links to additional information at:

“Flirting With Disaster”: How You Can Help!

We need to call for action!

Tell these contacts that you want to see the International Outfall Interceptor (IOI) fixed—and soon! Feel free to use the “Talking Points” below in your communications.

Senator John McCain: (you can copy/paste points below onto this online form in “message” box)
Tucson office: (520) 670-6334

Senator Jeff Flake:
(also an online form where you can copy/paste points below)
Tucson office: (520) 575-8633

Congressman Raul Grijalva:
Tucson office: (520) 622-6788

City of Nogales Mayor Doyle:
Office: (520) 285-5602

International Boundary and Water Commission (IBWC)
Public affairs office: Lori Kuczmanski (915) 832-4106


Talking Points

  • Binational sewage pipe (“IOI”) through Ambos Nogales needs repair SOON.
  • If the IOI breaks, the whole population of Nogales, Arizona will be exposed to raw sewage and industrial waste since it is downstream of Nogales, Sonora and the IOI runs right through the city.
  • Plans are already in place for a partial fix (“cure-in-place pipe”); it only needs funding to proceed.
  • Nogales, AZ is a small, poor city that uses only a small part of the IOI; most of the sewage in the IOI is Mexican.
  • Nogales, Sonora has serious drainage problems that need IBWC intervention to fix so erosion damage to border infrastructure like the IOI is minimized.
  • The IBWC’s job is to protect our border environment, and Congress needs to fund it so it can do its job to protect Americans from real border threats.

Download a .pdf with all the details!

For more information, be sure to watch FOSCR’s video on this issue, “Flirting With Disaster.” You can also contact Friends of the Santa Cruz River at with any questions or updates.


Please let us know if you contact any of the above, and thank you!

FOSCR’s New Video: “Flirting with Disaster”

Flirting With Disaster: Eroding Sewer Pipe Threatens Santa Cruz River

The International Outfall Interceptor (the “IOI”) sewage pipe is in danger of rupturing, spewing raw sewage and industrial waste over the poor border city of Nogales, Arizona, and into the Santa Cruz River watershed. The Federal government needs to fix the problem, caused by years of neglect, overuse, and sediment flows largely from across the border in Nogales, Mexico.

To draw attention to the major international issue, FOSCR has commissioned a video, Flirting With Disaster.”

Critical Issues:

  • Binational sewage pipe (“IOI”) through Ambos Nogales needs repair SOON!
  • If the IOI breaks, the whole population of Nogales, Arizona will be exposed to raw sewage and industrial waste since it is downstream of Nogales, Sonora and the IOI runs right through the city.
  • Plans are already in place for a partial fix (“cure-in-place pipe”). They only need the funds released to proceed.
  • Nogales, AZ is a small, poor city that uses only a small part of the IOI and most of sewage in IOI is Mexican.
  • Nogales, Sonora has serious drainage problems that need IBWC intervention to fix so erosion damage to border infrastructure like the IOI is minimized.
  • It is the International Boundary and Water Commission’s (IBWC) job to protect our border environment. Congress needs to fund it so it can do its job to protect Americans from real border threats.

How You Can Help:

1. Please share this video with your friends and on social media!
2. Contact these public officials. Feel free to use the “Critical Issues” above as your talking points.

For questions or assistance, contact Friends of the Santa Cruz River at

Press Release Highlights Plight of IOI Pipeline

McCain, Flake, McSally Introduce Bill to Unburden Nogales, Arizona From IOI Pipeline Costs

Under an existing agreement between the IBWC and Nogales, the city is currently responsible for a disproportionate percentage of the operating costs of the IOI. The Nogales Wastewater Fairness Act would transfer future capital costs to the IBWC while holding the city of Nogales responsible only for its equitable proportion of operation and maintenance costs that would be fairly split based on the city’s average sewage flow.

“At its core, the 1953 financial arrangement between Nogales and IBWC is outdated and unfair,” said Senator McCain. “Nogales residents should not have to pay for runoff and sewage not under their control. Our bill finally brings fairness to the people of Nogales who are dealing with out-of-touch bureaucrats mismanaging this crumbling infrastructure.”

“The burden of wastewater infrastructure operated pursuant to a U.S.-Mexico treaty should not fall disproportionately on the City of Nogales,” said Senator Flake. “This bill resets the cost-share to reflect the proper obligations of the IBWC.”

“Nogales has shouldered an unfair burden in paying for the operation and maintenance of this pipeline for too long,” said Rep. McSally. “I am happy to join Senator McCain today in introducing the Nogales Wastewater Fairness Act. This legislation will help address a longstanding problem and I look forward to working alongside him to get this passed through Congress and onto the President’s desk.”

“We are grateful for the tremendous support from Senators McCain and Flake and Congresswoman McSally on this effort,” said Guillermo Valencia, Chairman of the Greater Nogales Santa Cruz County Port Authority. “The Greater Nogales Santa Cruz County Port Authority has for many years advocated for the urgent need to address the issue of the IOI and after trips to Washington, D.C., arranging numerous site visits and meetings with many stakeholders, we are extremely glad to see the Senator take the lead to provide a solution. This is an issue that impacts the quality of life of the residents of Nogales, Arizona. But it also has a direct impact on the lives of the residents of Nogales, Mexico, and the entire Nogales-Tucson corridor. The significance of this legislation cannot be overstated.”


View FOSCR’s video, “Flirting with Disaster,” to learn more about the issues with the IOI Pipeline.
Contact these public officials. Feel free to use these “Critical Issues” as your talking points.

Read the press release online.

Gila Top Minnow, picture by Bruce Taubert/Arizona Department of Game and Fish

Where wild things swim—again

Gila Top Minnow, picture by Bruce Taubert/Arizona Department of Game and Fish
Gila Top Minnow, picture by Bruce Taubert/Arizona Department of Game and Fish

A recent High Country News article entitled, “Where the wild things swim—again. In a borderlands river, improved water quality allows an endangered fish to return” highlighted the return of the Gila Top Minnow. The Top Minnow—an endangered species—has been discovered again in the Santa Cruz River thanks to the release of effluent from the Nogales International Wastewater Treatment Plant.

Read the entire story. . . .