West Des Moines Ionwave #0510-032-2025 Addendum 1

Intersection Improvements and Traffic Signal Upgrades at 16th Street & Grand Avenue, West Des Moines, IA

The City of West Des Moines is seeking bids for major intersection improvements at 16th Street and Grand Avenue, involving extensive civil construction and traffic signal upgrades. - Government Buyer: - City of West Des Moines, City Clerk's Office, Public Services - OEMs and Vendors Mentioned: - Swarco McCain (traffic signal controllers) - EtherWan (managed Ethernet switches) - Polara (pedestrian push buttons) - Valmont, Millerbernd (traffic signal poles) - Corning (fiber optic cable) - Clary (battery backup system) - Products/Services Requested: - Roadway construction: excavation (450 CY), topsoil (461 CY), subbase (1832.5 SY), concrete and asphalt paving (over 1100 SY), curb and gutter (over 1200 LF), and sodding (2950 SY) - Stormwater and utility work: over 900 LF of reinforced concrete pipe (RCP) storm sewer (sizes 15"–48"), multiple manholes and intakes, water main relocations (60 LF of 12" DIP), valves, and hydrant adjustments - Traffic signal and electrical: pedestrian hybrid beacon (1), Swarco McCain FLeX controller, EtherWan switches, LED signal heads, Polara push buttons, Valmont/Millerbernd poles, Corning fiber optic cable (2160 LF), Clary SP1250 battery backup, signal/luminaire cables, and handholes - Traffic control: portable dynamic message signs (20), temporary barrier rail (312.5 LF), lane separator system (1200 LF), and signage - Erosion and environmental: SWPPP preparation/management, filter socks, hydromulching, inlet protection - Survey and monument: construction survey, monument preservation/replacement - Unique/Notable Requirements: - Strict adherence to detailed plans and specifications - Four-year maintenance guarantee post-acceptance - Preference for Iowa products and labor; statutory bidder preference applies - Coordination with local utilities (MidAmerican Energy, Mediacom) - Liquidated damages of $500/day for late completion - Traffic signal system must use specified OEM components for compatibility - Estimated Contract Value: - Approximately $1,000,000–$1,100,000 - Place of Performance: - 16th Street & Grand Avenue Intersection, West Des Moines, Polk County, Iowa - City of West Des Moines Public Services, 2727 SW Snyder Blvd, West Des Moines, IA 50023 - Council Chambers, 4200 Mills Civic Parkway, West Des Moines, IA

Description

The City of West Des Moines is soliciting bids for the 16th Street & Grand Avenue Intersection Improvements project. The work includes furnishing all labor, equipment, and materials for construction activities such as excavation, pavement removal, concrete pavement and widening, HMA overlay, curb and gutter installation, storm sewer installation, sanitary sewer manhole reconstruction, water main relocations, pedestrian hybrid beacon signal installation, pavement markings, sodding, traffic control, erosion control, and other miscellaneous work. Bids must be submitted electronically by June 3, 2026, and the project requires substantial completion by November 20, 2026, with final completion by April 30, 2027. The project is governed by plans and specifications prepared by Snyder & Associates, Inc., and includes a public hearing scheduled for June 15, 2026.

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