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This federal contract opportunity solicitation seeks construction services for a downstream filter underseepage mitigation project located at Gavins Point Dam in Nebraska. The solicitation was issued by the Department of the Army Corps of Engineers Engineering District Omaha under number W9128F20B0025. The project scope involves placement of granular filter materials in relief well outfall channels and a marsh area, installation of a collector pipe system and manholes to convey flows to Lake Yankton, and placement of riprap, seeding, and erosion control blanket. The construction performance period is 420 calendar days. The estimated value of construction work is between $1,000,000 and $5,000,000. All solicitation documents will be posted to the Beta SAM website.