County Route 9 Bridge Deck Rehabilitation
Deck rehabilitation of a two-span county highway bridge over a creek, including hydrodemolition of the deteriorated top mat, partial and full-depth repairs, a polyester polymer concrete overlay, new expansion joints and upgraded crash-tested rail. The contractor needed DOT-format unit prices for a staged construction sequence that kept one lane open.
Location
Portland, OR
Size
2-span, 310 LF deck
Estimated value
$4.3M
Estimate turnaround
7 business days
Scope estimated
What we measured and priced
- 13,600 SF of hydrodemolition to a 2-inch average depth with 92 CY of debris handling and water treatment
- 1,840 SF of partial-depth and 320 SF of full-depth deck repair with 9 tons of epoxy-coated replacement rebar
- 13,600 SF of 3/4-inch polyester polymer concrete overlay placed in 2 longitudinal stages
- 3 expansion joint replacements totaling 132 LF with new armored strip seals
- 620 LF of concrete bridge rail removal and replacement with MASH-compliant 42-inch barrier
- 8 elastomeric bearing replacements with jacking at the center pier
- 14 deck drains with 310 LF of downspout and scupper replacement
- Temporary traffic control for 2 stages with 1,240 LF of temporary barrier and a 16-week lane closure
The estimating challenge
Deck repair quantities on rehabilitation projects are never fully known until the hydrodemolition is done, and the county's condition survey was two years old. The plans listed partial-depth and full-depth repair as unit-price items with estimated quantities, but the contractor's profit depended on getting the overlay production rate right under a single-lane staged closure with a 16-week limit and liquidated damages. Bearings had to be replaced with the structure jacked, and the stream below carried in-water work restrictions that limited containment options during the wet season.
The result
LEEDS priced every DOT bid item from first principles, building crew-day production rates for hydrodemolition, overlay placement and joint work in each stage rather than applying a historical square-foot figure. We ran the partial-depth repair quantity at 1.4 times the survey estimate based on the delamination pattern and chloride data, and priced containment for the in-water restriction window. The contractor bid $4.3M and was awarded the project as low bidder. Actual repair quantities came in close to our adjusted figure, and the 16-week closure was met without liquidated damages.
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