Winters Road Case Study

Acrow Bridge Provides Temporary Access Over Putah Creek During Winters Road Bridge Replacement

The historic Winters Road Bridge, deemed structurally unsound, will be replaced with a new replica bridge during a three-year long project. During construction, a temporary Acrow bridge over Putah Creek will ensure undisturbed access for Northern California residents.

Originally built in 1908, the Winters Road Bridge arches over the Putah Creek, connecting Yolo and Solano counties. In 2007, this historic bridge received the lowest safety rating among Solano County-owned bridges due to water damage on the exposed timber pilings under the bridge’s pier supports. The damage to the structure’s foundation was determined to be irreparable.

For the past twelve years, environmental studies on the Putah Creek have prohibited the project from starting. Finally, in 2013, workers installed a temporary Acrow structure and began the demolition of the old bridge. While the Acrow bridge provides temporary relief for Northern California residents, a new permanent structure will be constructed to mimic the historic bridge’s most striking architectural feature: the three graceful, concrete arches on its underside. The new bridge, however, will have five arches instead of three because the new design requires more foundational support.

The three-year project was originally estimated to cost $12.2 million, but has since been recalculated to $15.3 million to include sidewalks and approaches to the bridge on both sides. The Federal Highway Bridge Program has provided the required funds.

Disney Construction will oversee the project and chose to use the Acrow 700XS panel bridge. The temporary structure consists of three 80 foot (24.38M) spans and one 120 foot (36.58M) span to create a 360 foot long (109.73M) bridge. It has an HL-93 design load, is 24 feet (7.35M) wide, and has TL-4 type guardrails. It will serve as a temporary bridge for approximately three years while the permanent replacement bridge is built.

Originally Disney construction planned to construct a bridge utilizing an Acrow bridge for only the 120 foot main span, and regular steel beam construction bridge for the three 80 foot spans. After much deliberation, Disney chose to utilize an Acrow bridge for the entire bridge span. The following reasons were cited:

– The bridge would be aesthetically more pleasing to the eye.

– The Acrow Bridge has a great track record with the DOT and would make the design and approval process easier.

– The construction of the temporary bridge would be quicker, thus saving time and money as well as improving the project schedule.

– Utilizing Acrow’s launching capabilities would have a similar effect.

Download Winters Road Case Study Bridge length:
  • Acrow supplied 360 linear foot (109.73M) continuous bridge with three 80 foot (24.38M) spans and one 120 foot (36.58M) span
Bridge width:
  • The Acrow bridge has a 24 foot (7.35M) clear travel way between the guide rails
Guide rails:
  • A test level 4 guide rail system was supplied by Acrow for the bridge
Deck surface:
  • Asphalt overlay
Bridge erection:
  • Full cantilevered launch
Live load:
  • The bridge was designed in accordance with AASHTO LRFD bridge design specifications fourth edition to HL-93 vehicular
Bridge design:
  • (A) Panel chords, diagonals and verticals, panel reinforcing chords, Rakers to AASHTO M223 GD 65
  • (B) Decking, raker brace, transom, top chord brace, swaybrace, transom brace, diagonal chord brace to AASHTO GD 50
  • (C) Panel pins to ASTM A 193 GD b7
  • (D) Bolts to AASHTO M164M – A325
Bridge finish:
  • – All major components galvanized to AASHTO M111-ASTM A 123
  • – All bolts are hot dipped galvanized
  • – All pins are electro galvanized