Three Mile Falls Diversion Dam

Overview

The Three Mile Falls Diversion Dam is a concrete multiple arch weir which diverts water to the West Division through the West Extension Main Canal. The dam is on the Umatilla River 3 miles south of Umatilla, Oregon, and has a structural height of 24 feet, a hydraulic height of 23 feet, and a crest length of 915 feet. The canal is 27 miles long and has a diversion capacity of 375 cubic feet per second.


General
RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
StateOregon
CountyUmatilla
ProjectUmatilla Basin
Dam Type
Reservoir
WatercourseUmatilla River
LocationThree miles south of Umatilla, Oregon
Longitude-119.3245482
Latitude45.882972
Original Construction1914
Modified Construction
National ID NumberOR00588
Hydrologic Unit Code

Dimensions
Structural Height24.00 ft
Hydraulic Height (Normal Operating Depth at Dam)23.00 ft
Top Parapet (Elevation)
Spillway Crest Elevation
Crest Elevation404.30 ft
Crest Length915.00 ft
Crest Width
Base Width
Volume of Dam Construction Materials5100.00 cu yd
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
Volume
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
Drainage Area
Hydrometeorological Report (HMR)
Probable Maximum Flood (PMF) Report

Contact Information
Owner
OrganizationWestland Irrigation District
AddressPO Box 944
CityHermiston, OR 97838
Phone (Office)541 667-2030
Operator
OrganizationWest Extension Irrigation District
Address840 S. Main St.
CityIrrigon, OR 97844
Phone (Office)541 922-3814


Last updated: Jan 07, 2009