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


Click HERE to view the watershed map
Click HERE to view the fact sheet
Click HERE to view the 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.

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

No issues have been identified to date. 


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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