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PRINEVILLE DAM
Crooked River Project, Oregon

General Information
Purpose: Irrigation, flood control, recreation, and fish and wildlife preservation.
Location: On the Crooked River about 20 miles upstream from Prineville, Oreg.
Constructed: 1958-1961
Date of closure (first storage): December 13, 1960

Reservoir
Name: Prineville

Average annual inflow (1928-1950): 188, 000 acre-feet
Maximum water surface elevation: 3257.9

Total capacity to normal water surface elevation 3234.8: 155, 000 acre-feet
Active capacity (elevation 3114. 0 to elevation 3234. 8): 153, 000 acre-feet
Surface area at elevation 3234. 8: 3, 010 acres

Dam
Type: Zoned earthfill
Foundation: Jointed basaltic lava
Volume: 1, 424, 000 cubic yards
Dimensions:

Structural height: 245 feet

Hydraulic height: 160 feet

Top width: 35 feet

Maximum base width: 950 feet

Crest length: 800 feet

Crest elevation: 3264. 0

Spillway
Location and type: Concrete crest and concrete chute at right abutment, uncontrolled
Crest elevation: 3234. 8
Crest width: 20 feet
Capacity: 8, 120 second-feet at maximum water surface elevation 3257.9

Outlet Works
Location and type: 11-foot-diameter concrete-lined tunnel through right abutment con-
trolled by two 6- by 4-foot regulating gates and two 6- by 4-foot
emergency gates

Capacity: 3, 300 second-feet at normal water surface elevation 3234. 8

Frontispiece--Prineville Dam and Reservoir viewed from rim of Crooked River gorge. elevation 3217. P113-129-823. July 19, 1961.

Water Surface is at

[graphic]

FOREWORD

Technical records of design and construction are a series of publications which record the planning, design, construction, and initial operation of Bureau of Reclamation structures.

This technical record of design and construction for Prineville Dam is divided into three parts. Part I is devoted to general planning, historical information, a description of the features, a summary of costs, and geology. In part II there are three chapters covering the design of the various features and their components. Part III contains one chapter on contract administration and one chapter comprising a concise narration of construction operations and equipment installation.

This technical record was prepared by the Technical Information Branch of the Office of Chief Engineer1/ in Denver, Colo., from final design reports submitted by the design branches, final construction reports and cost information submitted by the field offices, and various planning reports. Acknowledgement is gratefully made to the designers and field personnel for their contributions to this work.

There are occasional references to proprietary materials or products in this technical record. These must not be construed in any way as an endorsement, as the Bureau cannot endorse proprietary products or processes of manufacturers or the services of commercial firms for advertising, publicity, sales, or other purposes.

2/Formerly Office of Assistant Commissioner and Chief Engineer.

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