Crews have completed the Red Cabin Creek project between Lyman and Hamilton. The new bridge replaces a culvert, and allows water and debris to flow naturally under the highway.

Each winter heavy rain storms would cause Red Cabin Creek to rise and it would bring sediment and debris downstream which would plug the culvert beneath SR 20.   

Water flowing across the highway was not only a safety hazard for motorist, but the plugged culvert was a chronic problem for WSDOT Maintenance crews and spawning salmon.

In the Spring of 2011, construction of a new bridge over Red Cabin Creek began.  A temporary detour allowed construction of the new bridge on the existing alignment.  Sheet piling was installed so that a concrete seal could be placed and then the new bridge piers constructed in the dry. The concrete seals were approximately 9’ thick and 15’ to 20’ below the bottom of the creek channel.

The new bridge was designed using ten 68’ long voided slab girders with a 5” cast in place concrete bridge deck.  Using the voided slab girders reduced the depth of the new bridge, which helped reduce the length of SR 20 that needed to be raised to the provide more clearance between SR 20 and the creek.   

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Bridge Construction Training for Project Offices

Post Tensioning Class: Describes the field requirements to perform the post tensioning inspection both on bridges and soil nails and permanent ground anchors. The class goes over what post-tensioning is, filling out post tensioning notes, interpreting shop drawings, material requirements, and grouting. The class is for inspectors that haven't been involved in post tensioning inspection for several years and new inspector's. The class should be taken several weeks before post tensioning so the inspector has enough time to prepare for the inspection.

Shaft Inspection Class: Describes what are the field requirements to perform shaft inspection, goes over the current methods of shaft construction, conventional method, rotator, and oscillator method. Specification requirements, testing (CSL testing), obstructions, concrete placement, and miscellaneous details. This class is for new inspectors and inspectors that haven't been involved with shaft construction for several years. The class should be taken prior to the shaft driller arriving on the jobsite to begin work.

Just-in-Time Training for Bridge and Structures Construction Inspection

Bridge Painting
The fabrication inspection staff of the HQ Materials Lab will provide just-in-time training for field inspection of surface preparation and painting. This is a three hour class.

Bolt Installation and Welding
The fabrication inspection staff of the HQ Materials Lab will provide just–in-time training for field inspection of welding and bolting. This is a two hour class.

Pile Driving
The bridge construction staff of the HQ Construction Office will provide just-in-time training for field inspection of pile driving. This is a two hour class.

Soil Nail Walls, Soldier Pile and Tieback Walls
The geotechnical staff of the HQ Materials Lab will provide just-in-time inspection training for the soil nail and soldier pile walls. Permanent ground anchor (PGA) inspection will also be covered in this training. This is a two hour class.

Bridge Decks and Overlays Placement
Bridge deck wet curing is vital to achieving long term service life. The HQ Construction staff will discuss the BMPs during the pre-deck pour meeting.

For more information on these training opportunities please contact Mark Gaines, Marco Foster, or Stuart Bennion