Lower Granite Dam Unit 2

The Department of the Army, U.S. Army Corps of Engineers, Walla Walla District, has a requirement for Lower Granite Dam Unit 2 Blade Sleeve Upgrade.

Solicitation Summary

The Department of the Army, U.S. Army Corps of Engineers, Walla Walla District, has a requirement for Lower Granite Dam Unit 2 Blade Sleeve Upgrade.

Solicitation in a Nutshell

Item

Details
Agency Department of the Army, U.S. Army Corps of Engineers, Walla Walla District
Solicitation Number W912EF26RSS02
Status Pre-RFP
Solicitation Date 01/2026 (Estimate)
Award Date 04/2026 (Estimate)
Contract Ceiling Value $25,000,000
Competition Type Undetermined
Type of Award Other
Primary Requirement Architecture Engineering and Construction
Duration N/A
Contract Type  Firm Fixed Price
No. of Expected Awards N/A
NAICS Code(s):
237990

Other Heavy and Civil Engineering Construction
Size Standard: $45.0 million annual receipts except $37.0 million annual receipts for Dredging and Surface Cleanup Activities
Place of Performance:
  • Garfield County, Washington, United States
    • Lower Granite Dam
Opportunity Website: https://sam.gov/opp/e983ad917cee4a8a9633613bd375c688/view

Background

The Lower Granite Unit 2 Blade Sleeve Upgrade project is to restore the Unit 2 turbine to the original Kaplan functionality at Lower Granite Lock and Dam. Following multiple turbine blade sleeve failures, oversized static seals were installed on Unit 2, which has continued operating at a fixed blade angle for more than 5 years.

Requirements

  • Unit 2 will be completely unstacked for turbine runner disassembly. New blade sleeves and seals will be installed. The failed blade sleeve material is 410 Stainless Steel (410 SS) and the new blade sleeve material will be a martensitic, precipitation hardening stainless steel (17-4 PH SS). Unit 2 work will also include machining O-ring grooves and installing O-rings in various locations, including turbine shaft fasteners and the upper nose cone, to provide dependable hub oil seals. Reassembly will include pressure testing of the turbine hub before installation is complete.

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