Cedar Rapids Ionwave #3318551-01 Addendum 4

Cedar Rapids 8th Avenue Bridge Replacement and Cedar River Floodwalls

The City of Cedar Rapids is seeking a contractor to replace the 8th Avenue Bridge and build integrated flood-control infrastructure over the Cedar River. - Government buyer: City of Cedar Rapids, Public Works Department, Iowa. - Project scope: Demolish the existing bridge and construct a new cable-stayed bridge, integrated floodwalls, approach roads, traffic improvements, sidewalks and trails, utility work, lighting, retaining walls, and piling. - Named firm: Stanley Consultants prepared an MSE wall stability calculation; it is not identified as an OEM or product supplier. No bridge-system OEMs or product suppliers are named. - Stay cable system: One complete system (SP-020), including HDPE sheathing and the integral passive ice-management profile. Retain the specified ice-management system. The stay-cable system has Buy America classification and project-specific written FHWA concurrence and documentation requirements; no corrosion-protection coating is required. - Other specified items: 65 LF demonstration shaft; 17,080 LF steel HP 14 x 73 piles; construction materials and removal work listed below; test-pile materials include four HP 14x73 H-piles and two PZC-26 sheet piles, each 50 feet long. - Construction-material bid quantities: 15,221 SY Subbase Modified 6-inch; 1,471 SY Shared Use Path PCC 8-inch Class C Mix; 3,526 SY Sidewalk PCC 6-inch Class C Mix; 15,558 units of Sod; 12,981 LF each of 12-inch Filter Sock and Filter Sock Removal; and removal of 12 light poles. - Notable construction requirements: Salvage 600 feet of bridge railing for public distribution, 40 feet of railing and posts for public art, and at least a 16-foot steel girder section. Lead was detected in existing bridge paint, requiring applicable removal controls and protection of the public, utilities, and nearby structures. Test-pile monitoring found noise and vibration below structural-damage thresholds but above human-disruption limits at the Courthouse; ongoing monitoring during construction is recommended. - MSE wall considerations: The stability analysis covers seven walls and assumes a 250 psf surcharge, 75-year service life, and minimum 4-foot embedment. Wall 7 requires longer-than-typical reinforcement and aggregate-pier ground improvements; settlement improvements are specified beneath Walls 5 and 6. - Estimated value and duration: The engineer’s probable cost is approximately $123 million. Work is expected to start after Notice to Proceed, anticipated in early 2027, with final completion required within 1,250 calendar days. No option years or annual subscription are identified.

Description

The project generally includes demolition of the existing bridge and construction of a new cable-stayed bridge crossing with integral flood-control system components. Work also includes approach roadways, traffic improvements, sidewalks, trail reconstruction, utility reconstruction, and lighting. The project is located in Cedar Rapids, from 1st Street SW to 3rd Street SE along 8th Avenue SE/SW and Diagonal Drive SW. The source gives an engineer’s opinion of probable cost of $123,000,000 and a final completion period of 1,250 calendar days.

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