Alcova Dam Spillway Concrete Repairs

Owner: Bureau of Reclamation
Location: North Platte River, Natrona County, Wyoming
Project Summary: Alcova Dam forms a reservoir from which water is diverted into the Casper Canal for irrigation of lands in the Kendrick Project. The dam is a zoned earthfill structure rising 265 feet above its foundation and containing 1.6 million CY of material. Water is released for other irrigation rights downstream through the Alcova Power Plant or over a controlled spillway. Alcova Power Plant was authorized and built after the completion of Alcova Dam. It is on the right bank of the river opposite the toe of the dam.

The plant uses the 165-foot drop from the reservoir to the river for power generation. It consists of two units, each an 18,000KW vertical-shaft generator driven by a 26,500-horsepower turbine. The reservoir has a total capacity of 184,405 acre-feet, of which only the top 30,606 acre-feet is active capacity got irrigation. Principal components of work include construction and removal of a temporary coffer dam and saw cutting and removing damaged concrete on the downstream spillway and stilling basin retaining walls, retaining wall caps, and floor slabs in designated areas and replacing with new concrete. Removing downstream spillway and stilling basin handrails and chain link fence and replacing with new chain-link fence.