Crow Dam Spillway
Project Overview
The Crow Dam Spillway Project consisted of two phases: Phase 1 of construction (Area 2) consisted of replacement of the badly deteriorated existing chute and stilling basin with a new chute, a flip bucket, and armored apron to dissipate the energy prior to discharging into Lower Crow Creek. The Phase 2 (Area 3) consisted of the replacement of the existing side-channel inlet structure and tunnel with a piano key weir spillway crest structure, sloped trough, channel crossing beneath Crow Dam Road that will tie into the new structures constructed in Area 2, and installation of a bridge at the Crow Dam Road crossing.
Workflow Timeline
- Design: Phase 1: 2016-2018 Phase 2: 2017-2019
- Phase 1: 2016-2018
- Phase 2: 2017-2019
- Construction: Phase 1: 2018-2019 Phase 2: 2020-2022
- Phase 1: 2018-2019
- Phase 2: 2020-2022
Project Team
- CSKT
- BIA
- Design Consultant: Stantec (Phases 1 and 2)
- Contractor: Karnath Contracting (Phase 1) Big Sky Civil/Montana Joint Venture (Phase 2)
- Karnath Contracting (Phase 1)
- Big Sky Civil/Montana Joint Venture (Phase 2)
Status Update
- A controlled fill of Lower Crow Reservoir occurred in 2023 along with heightened monitoring to evaluate performance of the dam and new spillway. After review of the fill and monitoring performed and subsequent analysis, the dam safety risk was deemed to be lessened to a point where the reservoir restriction that was in place since 2006 could be lifted. CSKT Safety of Dams will continue with a standard monitoring program.
A controlled fill of Lower Crow Reservoir occurred in 2023 along with heightened monitoring to evaluate performance of the dam and new spillway. After review of the fill and monitoring performed and subsequent analysis, the dam safety risk was deemed to be lessened to a point where the reservoir restriction that was in place since 2006 could be lifted. CSKT Safety of Dams will continue with a standard monitoring program.
Photo Gallery
Ronnie Jo Horse, the executive director of Western Native Voice, poses for a portrait outside of Billings,Montana on October 25, 2021.
