2024
Environmental Engineering Project
Gibby Road Bridge
![Environmental Engineering Project](https://static.wixstatic.com/media/76868b_b8d6d82d1ca849109af317dd2baa7d8c~mv2.jpg/v1/fill/w_680,h_680,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/Image-empty-state.jpg)
The new Gibby Road Bridge replaces a 70-foot wide earthen embankment low-flow Arizona Crossing earthen embankment that crosses San Juan Creek. The bridge enabled the removal of the earthen embankment to restore the creek to a natural flow condition, allows for fish passage, and prevents roadway crossing closures during storm events that were common with the original crossing. The bridge consists of a single-span, cast-in-place pre-stressed concrete box girder structure spanning approximately 220-feet. The design approach overcame multiple constraints, both regulatory (environmental permitting/riparian protection), and physical (high groundwater, high sediment loads through the crossing, and flow/transport capacity continuity). The bridge structure required revetment consisting of a complex combination of grouted riprap installed over top of soilcrete columns constructed with jet grouting.