US HB4591

Establishes a Hen House Grant Program within 180 days to fund placement, construction, and maintenance of cylindrical nesting structures in the prairie pothole region to improve migratory waterfowl nesting success rates

Creates a Breeding Habitat Grant Program within 180 days to develop waterfowl breeding habitat in California through establishing nesting cover, creating brood ponds, and providing landowner incentives

Eligible grant recipients include state, local, and tribal governments, nonprofit organizations, and individuals

Allocates $3,500,000 annually for each grant program (totaling $7,000,000 per year) for fiscal years 2026 through 2030, funded from the Department of the Interior's Departmental Operations account

Targets species including mallards, gadwalls, and other breeding ducks, addressing declining nest success identified as the key driver of duck population declines in North America