Cal883432B 26-08 (Calhoun)

The Iowa Department of Agriculture & Land Stewardship, Division of Soil Conservation and Water Quality, is requesting bids for construction of a nutrient reduction wetland in Calhoun County, Iowa, with bids due August 26, 2026, and a pre-bid conference on August 12, 2026.

Bidders must be registered with the Iowa Department of Inspections, Appeals & Licensing. Non-Iowa corporations must provide proof of authorization from the Iowa Secretary of State to do business in Iowa prior to contract execution.

The scope comprises site stripping and preparation, excavation and grading, tied-concrete block mat placement (2,750 square feet), tile and outlet structure installation (769 linear feet), riprap and erosion stone placement (31 tons), and seeding (4 acres) across approximately 13,800 cubic yards of earthwork. The project is divided into 24 line items with quantities specified in various units of measure.

The estimated construction cost range is $135,000 to $155,000. Construction must commence within 7 days of the preconstruction meeting, with a construction deadline of November 30, 2026, and seeding deadlines of December 15, 2026. Most line-item delivery dates are June 15, 2027.

Bidders must submit a bid bond equal to 10% of the bid amount. The successful bidder will furnish a Performance/Payment Bond equal to 100% of the contract price. Bids are received through the Iowa Management of Procurement and Contracts System (IMPACS), with bid opening at 3:00 PM CDT on August 26, 2026. Written questions concerning plans and specifications must be submitted to Spencer Pech, P.E., at ISG by 3:00 PM on August 19, 2026, for inclusion in a final addendum. All other contract document questions should be directed to Tracy Bruun at the Division. Pre-bid conference attendance is encouraged but not mandatory.