Nepple WMA Wetland RT, Great Lakes Wildlife Unit, Dickinson County

The Iowa Department of Natural Resources, District 1, is requesting competitive bids for wetland restoration work at the Nepple Wildlife Management Area in Dickinson County, with bids due electronically by July 23, 2026 at 3:00 PM.

The scope includes embankment and dike construction (1,500 cubic yards of fill), spillway and borrow excavation, tile investigation and repair (200 linear feet), and installation of a water control structure with associated piping, anti-seep collars, corrugated metal piping in various sizes, trash guards, bedding stone (30 tons), erosion stone (80 tons), and seeding and mulching. The Iowa DNR will supply designated pipe materials marked "install only"; the contractor supplies all other materials and connections. Payment is on a unit-price basis; quantities in the bid schedule are approximate and may vary by up to 20 percent without automatic adjustment, though either party may request unit-price revision if variance exceeds 20 percent, provided such changes do not exceed 10 percent of total contract amount. Contractors are strongly encouraged to visit the site prior to bidding to assess conditions and verify dimensions.

Project completion is required by October 30, 2026, with work to commence within a reasonable period following the preconstruction conference. A performance bond equal to 100 percent of contract price is required if total cost equals or exceeds $25,000. Contractors must obtain an NPDES Stormwater Discharge Permit (DNR General Permit No. 2) prior to commencing work and comply with Iowa SUDAS specifications. Public liability insurance minimum coverage is $250,000 per person and $250,000 per occurrence; property damage coverage is $500,000 per occurrence. Liquidated damages are $500 per calendar day for work uncompleted after October 30, 2026. The contractor maintains a one-year warranty on all work following final departmental acceptance and is responsible for site cleanup and correction of rutting caused during construction.