Black Wash

To provide comments on this watershed for consideration in the Floodplain Management Plan, contact Greg Saxe
Planning Manager
(520) 724-4633.
The Black Wash’s headwaters originate on Black Mountain within the San Xavier District of the Tohono O’odham Nation. Tributaries from the northeastern slopes of the Sierrita Moun-tains south of San Xavier join it along with those emanating from the southwestern slopes of the Tucson Mountains. These combined flows join the West Branch of the Brawley Wash near Sandario Road.  Sheetflow flooding is common and the District has documented flooded structures in this area. While gener-ally fairly shallow, sheetflow flooding is also very widespread and makes accessing properties difficult. Floodwaters may rise quickly and may be very dangerous. It is important to protect your home from flooding and obtain flood insurance in this area, but it is not appropriate to prevent your property from flooding as this makes flooding worse for neighbors. This watershed is comprised of 44,994 acres and contains 13,437 acres of SFHA, 1,977 acres of locally identified floodplain and 3,034 acres of Pima County Regulated Riparian Habitat.

Flood Hazards


Click HERE to view the watershed map
Click HERE to view the outreach brochure
Click HERE to view the hazard map

Floodplain Studies

Floodplain Study FP-014-1990 - Southwest Basin Management Study, Anderson, Passarelli & Associates, 11/27/1990.

Floodplain Study FP-015-1990 - Black Wash Drainage Analysis, Administrative Floodway, 7/00/1990.

Floodplain Study FP-026-1994 - Southwest Basin Management Study Ph. II Part A, Volume 1 and Volume 2 Cella Barr Associates, 4/29/1994.

Floodplain Study FP-096-2018 - Red Butte/Saginaw Hill Area Technical Data Notebook for Hydrologic and Hydraulic Mapping, RFCD, 9/5/2018.

Erosion Studies

There are currently no erosion studies in this watershed.

Areas of Interest (Known Issues, Gaps, Problems and Needs)

Issues Provided by Public and Stakeholder Input

No issues have been identified to date.

Issues from the District Flood Response Manual

8.4.1 Data Gathering Needs
• No site specific issues identified.

8.4.2 Frequently Flooded Structures and Properties Subject to Damage
• Homes have been known to flood near Tillery St. and Jeffrey Rd. (T15S R12E Sec. 13)
• Branding Iron Park is a dense development in the Black Wash Floodway. (T15S R12E Sec. 10)
• Wade Road south of Bilby Road. (T15S R12E Sec. 10)

8.4.3 Infrastructure
• Look at collector channels for Camino Verde Estates II. (T15S R12E Sec 03)
• Look at collector channels for Star Valley subdivisions. (T15S R12E Sec 16)
• The drainageway on the east side of Tucson Estates Unit 6 , Book 20 Page 65, parcel 212-22-6370 is maintained by the county. (T14S R12E Sec. 25)

8.4.4 Safety Concerns
• Hazardous conditions exist where the Black Wash crosses Valencia Road. (T15S R12E Sec. 10)



Recommendation of Actions and Floodplain Management Strategy

This section to be completed based on feedback received through the planning process.

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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

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