Granite Reef Diversion Dam


Granite Reef Diversion Dam is located about 4 miles downstream of the confluence of the Salt and Verde Rivers and about 22 miles east of Phoenix. The dam was constructed between 1906 and 1908 by Reclamation to divert water released from storage dams on the Salt and Verde Rivers to Salt River Project canals.  The Arizona Canal serves the north side of the project; the South Canal serves the south side.  From these two main canals, water is diverted to secondary canals, then to laterals through which water is delivered to farms, cities, and Indian tribes.

The dam is 1,128 feet long, and 29 feet high.  The sluiceway contains four 15-by-9-foot slide gates on the North Side Canal, and two 15-by-9-foot slide gates on the South Side Canal. The North Side Canal headworks contain eighteen 7-by-5-foot slide gates, while the South Side headworks contain nine of these gates.

RegionFacilities in Lower Colorado | Lower Colorado Home Page
ProjectSalt River
Dam TypeConcrete ogee weir
WatercourseSalt River
Location22 miles east of Phoenix, Arizona
Original Construction1906-1908
Modified Construction
National ID NumberAZ10316
Hydrologic Unit Code

Structural Height29 ft
Hydraulic Height (Normal Operating Depth at Dam)18 ft
Top Parapet (Elevation)
Spillway Crest Elevation
Crest Elevation1310.0 ft
Crest Length1,128 ft
Crest Width
Base Width
Volume of Dam Construction Materials35,000 cu-yds
Streambed at Dam Axis
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)

Hydraulics & Hydrology
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation
Spillway Type
Auxiliary Spillway
Spillway Capacity at Elevation
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation
Diversion Capacity at Elevation North Side Canal - 2000 cfs South Side Canal - 1600 cfs
Drainage Area
Hydrometeorological Report (HMR)
Probable Maximum Flood (PMF) Report

Contact Information
TitleArea Office Manager
OrganizationPhoenix Area Office
Address6150 West Thunderbird Road
CityGlendale, AZ 85306-6200
Phone (Fax)623 773-6480
Phone (Office)623 773-6200
OrganizationArea Office Manager
AddressPhoenix Area Office
CityPhoenix, AZ 85306-6200
Phone (Office)623 773-6200

Last updated: Jun 10, 2009