Howard Prairie Dam

Overview

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
RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
StateOregon
County
ProjectRogue River Basin
Dam TypeZoned Earthfill
ReservoirHoward Prairie Lake
WatercourseJenny Creek
Location
Longitude-122.3770
Latitude42.2168
Original Construction1957-1958
Modified Construction
National ID NumberOR00580
Hydrologic Unit Code

Dimensions
Structural Height100.0 ft
Hydraulic Height (Normal Operating Depth at Dam)88.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation4533.4 ft
Crest Elevation4539.00 ft
Crest Length1040.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis4451.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)4526.6 ft
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)4471.0 ft

Hydraulics & Hydrology
Total Water Storage at Elevation60,600 ac-ft
Maximum Water Surface Elevation
Normal Water Surface Elevation4526.6 ft
Spillway Type Ungated overflow
Auxiliary SpillwayNo
Spillway Capacity at Elevation1,710.0 cfs at 4533.4 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation95.0 cfs at 4526.6 ft
Diversion Capacity at Elevation
Drainage Area
Hydrometeorological Report (HMR)
Probable Maximum Flood (PMF) Report

Contact Information
Owner
TitleArea Office Manager
OrganizationColumbia-Cascades Area Office
Address1917 Marsh Road
CityYakima, WA 98901-2058
Phone (Fax)509 454-5611
Phone (Office)509 575-5848 x202
Operator
OrganizationTalent Irrigation District
AddressPO Box 467
CityTalent, OR 97540-0467
Phone (Office)541 535-1529


Last updated: Apr 30, 2009