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 four safety and roadway/bridge improvement projects on or adjacent to State Route 89A (SR 89A) between the cities of Sedona and Flagstaff. Three of the projects will require traffic restrictions and are being coordinated to minimize traffic impacts. The four projects are:

  • Pumphouse Wash Bridge rehabilitation (H8778)
  • Sedona City Limits to Bear Howard Drive Pavement Rehabilitation (F0047)
  • 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.

Sedona City Limits to Bear Howard Drive Pavement Rehabilitation

Drivers should plan for lane closures on State Route 89A east of Sedona at Midgley Bridge (milepost 376) and Oak Creek Bridge (milepost 381) beginning Monday, April 27, and ending Thursday, April 30, to complete resurfacing of the bridge decks.

The resurfacing work over four days, scheduled from 4 a.m. to 7 p.m., requires the bridges to be narrowed to a single lane. Flaggers will direct traffic through the work zone. Drivers can expect delays of up to 15 minutes and should allow extra travel time, slow down in the work zone and use caution around construction personnel and equipment.

Crews have already completed pavement preservation work on SR 89A, from Sedona city limits to south of Pumphouse Wash Bridge (milepost 375 to milepost 387). In addition, crews recently replaced guardrail along the roadway to meet current safety standards and turnout modifications to improve safety.

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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