State Route 89A Safety and Road/Bridge Improvements


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The Arizona Department of Transportation (ADOT) in conjunction with the Federal Highway Administration (FHWA), is planning three safety and roadway/bridge improvement projects on or adjacent to State Route 89A (SR 89A) between the cities of Sedona and Flagstaff. The three projects will require traffic restrictions and are being coordinated to minimize traffic impacts. The projects are:

  • Pumphouse Wash Bridge rehabilitation (H8778)
  • Rockfall mitigation (F0154)
  • Oak Creek drainage and sediment control (H8907)

Pumphouse Wash Bridge Rehabilitation

The Pumphouse Wash Bridge was constructed in 1931 and is located on SR 89A at milepost 387. Options to rehabilitate or replace the existing bridge have been under evaluation since October 2006. The bridge is a historic structure listed on the National Register of Historic Places, and full replacement of the bridge would negatively impact endangered species, stream water quality, and the historic nature of the bridge. These factors led to the determination that the bridge will be rehabilitated to extend its service life.

Work to rehabilitate the bridge will result in single-lane closures on SR 89A for approximately three months. During this time, north- and southbound traffic will be reduced to one lane of alternating travel, while the other lane is closed to allow work on the bridge deck. Traffic-control personnel will be onsite to direct drivers through the work zone. A schedule of traffic restrictions will be provided prior to construction.

Rockfall Mitigation

The rockfall mitigation project will help reduce the potential of rocks falling onto the travel lanes at two locations along SR 89A. The first location is near Sedona city limits at milepost 375, and the second location is located in the switchback section of the roadway at milepost 389.

Rockfall mitigation work is tentatively scheduled to begin fall 2020, and it’s anticipated to take five to six months to complete. To ensure the safety of drivers and work crews during rock-removal operations, intermittent closures of some parts of the highway will be necessary. A schedule of traffic restrictions will be provided prior to work beginning.

Oak Creek Drainage and Sediment Control

The erosion-control project includes installing retaining walls, stabilizing slopes, increasing roadside ditch capacity, and adding inlets and roadway cross-culverts to preserve deteriorating slopes and reduce sediment transport between mileposts 388 to 389. A schedule of traffic restrictions will be provided prior to construction.

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