Howard Prairie Dam is a zoned earthfill structure, with a height of 100 feet and a crest length of 1,040 feet that contains 416,000 cubic yards of material. The reservoir created by the dam has a total capacity of 62,100 acre-feet (active 60,600 acre-feet). The dam is on Beaver Creek, 18 miles east of Ashland, Oregon.
Geology
The damsite geology consists of hard fresh medium grained basalt, about 29 feet thick, underlies the relative thin mantel of sandy topsoil. Unconformably underlying the basalt are lacustrine and aeolian deposits. On the left abutment, this deposit is a tuff breccia about 30 feet thick; on the right abutment these deposits consist of claystones, siltstones and diatomite as tuff and tuff breccia.
General
Project
Rogue River Basin
Dam Type
Zoned Earthfill
Longitude
-122.3770
Latitude
42.2168
Watercourse
Jenny Creek
Reservoir
Howard Prairie Lake
Original Construction
1957-1958
National ID Number
OR00580
Dimensions
Crest Elevation
4539.00 ft
Hydraulic Height (Normal Operating Depth at Dam)
88.0 ft
Crest Length
1040.0 ft
Top of Active Conservation Pool (Elevation)
4526.6 ft
Spillway Crest Elevation
4533.4 ft
Streambed at Dam Axis
4451.0 ft
Structural Height
100.0 ft
Top of Dead Storage Pool (Elevation)
4471.0 ft
Hydraulics & Hydrology
Spillway Type
Ungated overflow
Spillway Capacity at Elevation
1,710.0 cfs at 4533.4 ft
Total Water Storage at Elevation
60,600 ac-ft
Outlet Works Capacity at Elevation
95.0 cfs at 4526.6 ft
Normal Water Surface Elevation
4526.6 ft
Auxiliary Spillway
No
Contact
Owner
Title: Area Office Manager Organization: Columbia-Cascades Area Office Address: 1917 Marsh Road City: Yakima, WA 98901-2058 Fax: 509-454-5611 Phone: 509-573-8000
Operator
Organization: Talent Irrigation District Address: PO Box 467 City: Talent, OR 97540-0467 Phone: 541-535-1529
More Information about the U.S. Bureau of Reclamation
