January 19, 2023 1:00 pm
Jarred Burrows, P.E., Structure Representative, Office of Structure Construction, Division of Engineering Services, California Department of Transportation (Caltrans); and Q&A panel members Parvin Sebti, P.E., the Bridge Construction Engineer for the project, and Laura Cangas, the Assistant Structure Representative for the project, both with Structure Construction of the Division of Engineering Services in Caltrans
California’s Jacoby Creek Bridge Replacement Jack & Slide (101 SB, Left Bridge) - pdf of presentation
- Caltrans ABC Manual - link to Caltrans website [scroll to “Bridge Design and Seismic” heading; click “Accelerated Bridge Construction Manual (PDF)”]
- Structure Plans (sheets 55-71) - pdf [Note: There are no links to ABC specific sections of the contract documents. The project was evenly split in terms of cost of structure portions vs roadway portions, so all contract documents generally relate to the Jacoby Creek Bridge jack and slide in some way. For example, the project plans have more references to Jacoby Creek slide regarding traffic handling, signage, closure schedules, etc. beyond just the “Structure Plans” shown in sheets 55 thru 71, inclusive. Readers should be able to use the Caltrans Special Provisions (link below) in tandem with the Caltrans 2018 Standard Specifications (link below) to find the most relevant specification sections which are most sections in the Special Provisions:
- 10 General (for limited construction window),
- 12 Temporary Traffic Control (for allowable highway closure times, etc.),
- 48 Temporary Structures (checking the contractor’s design),
- 49 Piling,
- 51 Concrete Structures (deck and precast),
- 52 Reinforcement,
- 60-6 Superstructure Move, and
- 90 Concrete (deck and precast).
- Special Provisions - pdf [Note: includes Revised Standard Specifications]
- 2018 Standard Specifications - link to Caltrans website [Note: scroll to “2018 Standard Specifications” heading]
- Contractor’s Final Schedule Update - pdf [Note: used only to check overall project critical path.]
General Note: The jack and slide itself was part of a contract for three bridge replacements. This contract is incidental to another project a few miles to the south on 101 called “Indianola Cutoff,” which is part of a series of projects to widen and modernize the safety corridor between Arcata and Eureka.
Q&A Session - pdf
News - January 19, 2023 - pdf of presentation
Description: The original southbound Jacoby Creek Bridge was constructed in the 1920s as a two-lane highway in both directions and modified in 1956. The old bridge was a three-span structure with pier supports within the creek channel. The new single-span bridge is supported on new abutments with twelve 36-inch-diameter cast-in-steel shell (CISS) piles along the banks of Jacoby Creek. The new bridge carries southbound highway 101 traffic and is approximately 73 feet long and 43 feet wide, approximately four feet wider than the previous bridge. The bridge is raised two feet higher than the previous bridge in anticipation of future sea-level rise issues. The new bridge was built in the highway median, with traffic detoured during the demolition of the old bridge. New bridge abutments and piles were built in the permanent location, and the new bridge was moved from the highway median to the southbound 101 using a jack-and-slide method in mid-2022. The presentation provides design and construction details and lessons learned.
Jarred Burrows, P.E.
Office of Structure Construction,
Division of Engineering Services,
California Department of Transportation
Jarred received his Bachelor of Science degree in Civil Engineering from Cal Poly San Luis Obispo in 2012. He started working for a drilling and shoring engineering contractor upon graduation where he worked on a wide variety of geotechnical and structural projects as a field engineer and project manager. After moving to Eureka, he joined the Caltrans Office of Structure Construction in March 2020. His experience from the private industry prepared him to step into his role as Structure Representative and was assigned to work on the Jacoby Creek Bridge in April 2020 until project completion in October 2022.