2011 - Craig Creek Bridge
- Year ABC Built: 2011
- State: California
- Owner: State
- Location: Rural
- Spans: One-span
- Beam Material: Concrete
- Max Span Length (ft.): 108.00
- Total Bridge Length (ft.): 108.00
- Construction Equipment: Conventional
- State ID #: 08-0168
- NBI #:
- Coordinates: Latitude: 40.0317726, Longitude: -122.0998688
- Project Summary:
- Project Location: State Route 99 over Craig Creek near Los Molinos in Tehama County, in northern California
- Mobility Impact Time: ABC: 29 calendar days ; Conventional: 3 months
- Impact Category: Tier 4 (within 1 month)
reduced traffic impacts; reduced onsite construction time; improved site constructability; improved material quality and product durability; minimized environmental impacts
- Dimensions: 108-ft long and 44-ft wide single-span precast adjacent box beam bridge
- Average Daily Traffic (at time of construction): 100
- Traffic Management: Traffic management alternative, if constructed conventionally: 3-month use of two-stage construction with signalized one-lane traffic control
- Existing Bridge Description: The existing three-span reinforced concrete bridge was 89.5 ft long and 42.33 ft wide with pile extension substructure. The bridge had scour damage and required replacement.
- Replacement or New Bridge: The replacement bridge has two 12-ft-wide traffic lanes, a 9-ft-wide shoulder, and an 8-ft-wide shoulder. The cross-section consists of eleven 4-ft-wide 3.5-ft-deep abutting precast box beams with a 5-inch-thick 4000-psi cast-in-place reinforced concrete deck. The precast abutments were founded on cast-in-steel shell (CISS) piles.
- Construction Method: The contractor drove the CISS piles and paved over them in the fall of 2010, with work then stopped due to contract administration issues. In the fall of 2011 the contractor launched a temporary bridge and detoured traffic onto the temporary bridge. The existing bridge was closed and demolished. Abutments were excavated. The precast abutment caps with backwalls were erected over the CISS piles, the abutment segment closure joints were cast, and the cap pockets were filled with concrete. After the abutment closure joint and cap pocket concrete was cured, the precast box beams were set on elastomeric bearing pads. Abutment backfill was placed. The transverse tie rods in ducts at mid-depth of the beams were stressed to 20 percent, and the shear keys between the beams were grouted. After the grout cured, the transverse tie rods were fully stressed. The high-performance concrete (HPC) deck was constructed, and the transverse ducts in the beams were grouted. The deck was cured. Temporary barriers were placed to protect crews constructing the cast-in-place traffic railing, and the bridge was re-opened to traffic. Diamond drum grinding was completed several weeks after the bridge was re-opened to traffic to improve ride quality and reduce tire noise. No deck overlay was applied; Caltrans plans to apply a methacrylate deck treatment if cracks appear in the deck. The temporary bridge was delivered to the site on September 14, launched September 15, and was open to traffic beginning September 26. The old bridge was demolished and the replacement bridge was constructed, with deck concrete placed October 20 and the bridge opened to traffic four days later on October 24. The temporary bridge was shipped out October 27.The bridge was originally designed for two-stage construction but was changed post-bid through a Value Engineering Cost Proposal Change Order by the contractor, to be built in a single-stage with the use of a flagger-controlled single-lane temporary Mabey bridge detour. The contract restricted access in Craig Creek from July 15 to October 15. No incentives or disincentives were included in the contract.
This project included research on accelerated bridge deck construction procedures. The cast-in-place concrete deck used an early-strength-gain mix design to reduce construction duration and included a shrinkage-reducing admixture to counter long-term drying shrinkage. Also, synthetic fiber reinforcement was included to reduce plastic cracking and improve longer-term crack control, and an additional quarter-inch (sacrificial) thickness was allowed for subsequent diamond drum grinding. In addition, a faster and improved curing method was used to reduce construction duration; in this method the water curing time was reduced to three days followed by a second heavy application of spray-on curing compound.
Craig Creek was the second Caltrans project to employ precast abutments and the first to divide the abutments into multiples sections to improve transport and constructability. Now that the efficacy of this approach has been established, the use of precast abutments can be considered a “new normal” for EDC applications. Caltrans will be issuing contract documents for ABC projects with a special awareness logo alerting subcontractors and suppliers to the fast tempo and commensurate attention required in construction. In addition, Caltrans will continue to monitor the deck performance at Craig Creek. Assuming the deck continues to perform well the HPC methods for deck concrete along with the innovative mix design to control cracking will be applied to future projects.
- High Performance Material: High-performance concrete (HPC) cast-in-place deck
- Decision Making Tools: (none)
- Site Procurement: (none)
- Project Delivery: Design-bid-build
- Contracting: Full lane closure; Value Engineering
- Foundations & Walls: (none)
- Rapid Embankment: (none)
- Prefabricated Bridge Elements: Adjacent box beams; Precast abutment cap w/backwall; Precast wingwalls
- Prefabricated Bridge Systems: (none)
- Miscellaneous Prefabricated: CIP reinforced concrete closure joints; Grouted key closure joint; PT ducts/bonded; Pocket connection (in precast substructure)
- ABC Construction Equipment: Conventional
- Costs: The engineer’s estimate for the bridge portion of the project was $1.379 million. The low bid was $998,000 ($381,000 = 28% lower than the engineer’s estimate). There were nine bidders. The signalized-control delay costs to the travelling public were calculated at $7,800 per day. For the initially-planned staged construction duration of 40 days, this would have totaled $312,000. Due to the late award, this delay cost would have been over $2.4 million had the contractor proceeded with half-width construction and a winter suspension.
- Funding Source: Federal and State
- Incentive Program: (none)
Cost & Funding
Downloadable ResourcesContract Plans:
Other Related Information:
Photo Credits: California Department of Transportation
ContactsOwner: Sonny Fereira, P.E.
Area Bridge Engineer
California Department of Transportation
Bridge Description Summary Sheet: