Duchesne County officials report higher road and bridge maintenance costs after geotechnical findings

County staff reported a geotechnical discovery on a new road project that has increased construction costs and could delay completion.

Officials said crews encountered mudstone during site preparation for a new road check, and contractors must add a clay bedding layer to encapsulate the material. “That’s expensive,” a staff member said during the meeting. Staff said the county is proceeding with bedding and ongoing dirt work for the project.

The county also discussed several maintenance projects that have been accepted for the year and a scheduled walk-through. Staff described work on North Crescent and other local maintenance, noting some additional paving and grading to finish remaining segments.

Separately, members discussed river-channel and bridge concerns. One speaker described a section of road about half blocked by overgrown siltation and said clearing is difficult absent an emergency declaration. Officials said the county is planning a bridge replacement “sooner than later” for an aging structure that was described in the meeting as an older model; they also said the bridge appears structurally sound but shows cosmetic deterioration as drivers pass it.

Speakers raised a related environmental and permitting issue: a plant the meeting transcript referred to as “Eustace Traps” was said to be nearing delisting, and participants questioned whether that has constrained channel-clearing work. A staff member said the county does have a project to address the channel and that work will need coordination with state or other controlling agencies before significant clearing is done.

Staff and commissioners also discussed constraints on in‑stream work: heavy equipment must fit under bridges and cofferdams can make removal and reinstatement of material easier, but irrigation lines and other utilities complicate operations. A speaker noted an irrigation pipe running through a sand channel that complicates excavation.

No formal vote or formal action was recorded on the items discussed; the meeting log shows the topics were discussed as part of project updates and planning.

Clarifying details discussed at the meeting included the need to bed the geotechnical zone with clay, maintenance-project walk-throughs scheduled by staff, and limits on proactive channel-clearing absent emergency authority or coordination with owning agencies. Specific budget figures for the additional bedding or the bridge replacement were not specified in the discussion.

The county said it appreciates partner support on maintenance work and will continue to coordinate with state and local partners on permitting and scheduling of in‑stream or bridge work.