Big Wash

To provide comments on this watershed for consideration in the Floodplain Management Plan, contact Greg Saxe
Planning Manager
(520) 724-4633.
The Big Wash, along with Sutherland Wash, drains the western slopes of the Santa Catalina Mountains and the eastern slopes of the Tortolita Mountains into the Cañada del Oro Wash. The Cañada del Oro Wash and Big Wash enter Pima County from Pinal County near the community of Catalina. The Cañada del Oro Wash has very steep and rocky upper slopes and flash flooding is a significant concern. There are a number of at-grade wash crossings that can be extremely hazardous during flows, including where the Cañada del Oro Wash crosses Overton Road. Fires on Mount Lemmon can significantly increase the risk of flooding in this area. This watershed is comprised of 86,415 acres and contains 4,763 acres of SFHA, 371 acres of locally identified floodplain and 6,444 acres of Pima County Regulated Riparian Habitat.

Flood Hazards


Watershed Map 
Outreach Brochure
Hazard Map 

Floodplain Studies

Floodplain Study FP-005-1986 - Highlands Wash Basin Management Plan Report, A-N West, Inc., July 15, 1986 and Phase III Final Report, Camp Dresser & McKee, Inc., 1/25/1990.

Floodplain Study FP-009-1988 - Sutherland Wash, H&H Report, PC DOT&FCD, 8/9/1988.

Floodplain Study FP-016-2006 - [Upper] Canada Del Oro Wash Letter of Map Revision Study, David Evans and Associates, 10/28/2004.

Floodplain Study FP-022-1992 - 27 Mile Wash Flood Plain Delineation Study, Collins-Pina Consulting Engineers Inc., August 1992

Floodplain Study FP-041-2000 - Chaparral Heights -- annexed by Oro Valley.

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

Big Wash 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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