Final_Bridge_Hydraulics_Report.pdf

This is a Final Bridge Hydraulics Report prepared for the Ada County Highway District (ACHD) in support of the Eckert Road Bridges 2147 and 2148 reconstruction project in Boise, Idaho. The project encompasses demolition and reconstruction of two bridges spanning the Boise River (364 feet across three spans) and Ridenbaugh Canal (91 feet across one span), along with construction of a single-lane roundabout at the Eckert Road and Boise Avenue intersection, a multi-use pathway, a Greenbelt underpass, roadway reconstruction, drainage improvements, and utility adjustments. Sealed bids were due August 19, 2026, at 3:00 p.m. through the ACHD eProcurement Portal, with questions required by August 14, 2026, at 12:00 p.m. The Notice to Proceed is anticipated for October 1, 2026, with substantial completion required by June 21, 2028 (approximately 20 months). Contract award is anticipated within 60 calendar days of bid opening.

The estimated contract value exceeds $25 million with bid security set at 10 percent of the total proposal amount. Liquidated damages of $12,000 per calendar day apply for failure to meet completion deadlines, with no extensions granted for weather, utility delays, material procurement, labor shortages, or contractor performance issues. Bidders must be licensed Idaho Public Works Contractors (Type 1, 2, or 4) and submit unit-price proposals. The successful bidder must furnish Performance and Labor/Material Payment Bonds equal to the full contract price, provide commercial general liability insurance of $2 million, automobile liability of $2 million, and statutory workers' compensation with employer's liability of $1 million. Contractors domiciled outside Idaho must bid at a percentage less than the lowest Idaho-domiciled bid per Idaho Code. No federal aid funds finance the project; all applicable state and local sales and use taxes must be included in bid prices. Environmental authorizations include U.S. Army Corps of Engineers Nationwide Permit 14, Idaho Department of Environmental Quality 401 Water Quality Certification, and Idaho Department of Water Resources Stream Channel Alteration Permit requiring low-flow construction timing and dewatering plan submission at least four weeks prior to construction.