Santa Cruz – Upper

To provide comments on this watershed for consideration in the Floodplain Management Plan, contact Greg Saxe
Planning Manager
(520) 724-4633.
The portion of the watershed identified as the Upper Santa Cruz River extends from the Santa Rita Mountain ridge in the southeast, across the Santa Cruz River basin to the Sierrita Mountains in the southwest. Its northern terminus is south of Martinez Hill and Black Mountain and the northern boundary of the San Xavier District of the Tohono O’odham Nation, and includes the confluence of the major tributary, Lee Moore Wash. Excluding the Lee Moore Wash watershed, it is comprised of 336,918 acres. Largely unaltered by flood control works, the Upper Santa Cruz River has a wide, riverine floodplain. Nevertheless, it largely impacts agricultural lands. Flood insurance is recommended for any structure near the river or its tributaries. This watershed contains 11,475 acres of SFHA, 44,946 acres of locally identified floodplain and 48,968 acres of Pima County Regulated Riparian Habitat.

Flood Hazards


Watershed Map 
Outreach Brochure 
Hazard Map 

Floodplain Studies

Floodplain Study FP-011-1989 - Green Valley Drainageway No.9, CMG Drainage Engineering Inc., 1/12/1989.

Floodplain Study FP-028-1994 - Hydrology/Hydraulics Report for Demetrie Wash, McGovern, MacVittie, Lodge & Associates, Inc., 10/13/1994.

Floodplain Study FP-038-1999 - Sahuarita Basin Management Study, CMG Drainage Engineering Inc., 1/5/2000.

Floodplain Study FP-085-2014 - Green Valley Drainageways Basin Management Study (Large file:  40 MB PDF), Figure 4B and Figure 5 (Large file:  20 MB PDF), CMG Drainage Engineering, Inc., 6/27/2014.

Floodplain Study FP-097-2019 - Upper Santa Cruz RiskMAP Technical Data Notebook for Hydrologic and Hydraulic Mapping, JE Fuller, 03/25/2019.

Erosion Studies

There are currently no erosion studies in this watershed.

Step 6 - Floodplain Management Plan Goals

Floodplain Management Plan Goals

Recommendation of Actions and Floodplain Management Strategy

Upper Santa Cruz Action Plan Map

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Regional Flood Control District

201 N. Stone Avenue, 9th Fl.
Tucson, AZ 85701

Phone: (520) 724-4600
Fax: (520) 724-4621

Customer Service Hours:
8:00AM - 4:00PM

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