Cedar Rapids Ionwave #3318551-01 Addendum 6

Cedar Rapids 8th Avenue Bridge Replacement and Cedar River Floodwalls

The City of Cedar Rapids Public Works Department is seeking bids for a major bridge replacement and flood-control project along the Cedar River. - Buyer: City of Cedar Rapids, Public Works Department. - Project: Replace the existing 8th Avenue Bridge with a cable-stayed bridge and construct floodwalls, approach roads, traffic improvements, sidewalks and trails, utility work, drainage, and lighting. - OEMs and vendors: No OEM is identified or designated. Stanley Consultants is named as the preparer of an engineering analysis; no product vendor is specified. - Key bid items and materials: Subbase Modified 6-inch (15,221 SY; 2010-J), shared-use path PCC 8-inch Class C mix (1,471 SY; 7030-C), sidewalk PCC 6-inch Class C mix (3,526 SY; 7030-E), sod (15,558 SY; 9020-A), 12-inch filter sock and removal (12,981 LF each; 9040-D-1 and 9040-D-2), removal of light poles (12; 2401-6745765), demonstration shaft (65 LF; 2433-0003000), steel HP 14 x 73 piles (17,080 LF; 2501-0201473), and one stay cable system (SP-020). - Test-pile items: Four 50-foot HP 14x73 H-piles and two 50-foot PZC-26 sheet piles were used in the test-pile program; these are separate from the larger bridge bid quantity for steel HP 14 x 73 piles. - Notable requirements: The stay-cable system must include its integral passive ice-management profile. FHWA written concurrence and compliance documentation are required for the proposed cable-system classification and manufacturing plan; the addendum clarifies that no corrosion-protection coating is required. The bike-path railing must use domestic-origin duplex stainless steel. - Demolition and site requirements: Salvage 600 feet of railing for public distribution, 40 feet of railing and posts for public art, and at least 16 feet of variable-depth steel girder. Lead was detected in existing bridge paint, requiring applicable lead-removal measures and protection of the public, utilities, and nearby structures. - Engineering and monitoring considerations: Project documents address stability of seven mechanically stabilized earth walls, including a 75-year service-life criterion, 250 psf surcharge, and minimum 4-foot embedment. Vibration and noise monitoring during pile driving is recommended; test results identified disruption-level exceedances at the Courthouse. - Estimated project cost: Approximately $123 million. Final completion is required within 1,250 calendar days after notice to proceed.

Description

The City of Cedar Rapids is seeking bids for replacement of the 8th Avenue bridge and construction of floodwalls at the Cedar River. The work includes demolition of the existing bridge; construction of a new cable-stayed river bridge and integral flood-control components; and approach roads, 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. Final completion is due within 1,250 calendar days.

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