Commission conditions grading permit at 449 West Main on favorable hydrologic/hydraulic analysis

The Rockville Planning Commission on May 13 approved a grading and excavation permit for work on the riverbank at 449 West Main Street submitted by Doyle Timmons, but the approval is conditioned on a favorable hydrologic and hydraulic analysis.

The application seeks to restore and stabilize an embankment that an applicant representative said was eroded by recent floods. The applicant’s representative and contractor told the commission the work follows an order and recommendations from the state engineer and that the intent is to restore the pre-erosion channel and protect Mr. Timmons’s property. The proposed work uses riprap and rock recommended by the state engineer; some commissioners and neighbors questioned whether bioengineering (root wads, willow plantings, large woody debris) would be less visually intrusive and more natural.

Neighbor Jacob Anderson spoke during public comment and said he had sent a letter urging a flow study and asked how proposed riprap would affect downstream properties; he offered to pay half the cost of a study. A letter from Tracy J. Harrison, state floodplain program manager (Utah Division of Emergency Management), arrived the day of the meeting and suggested a full hydrologic and hydraulic analysis to determine whether the project would cause a rise in the 1% annual chance flood elevation in the mapped special flood hazard area.

Commissioners discussed options: deny the application; approve without additional study; or approve contingent on a favorable hydrologic and hydraulic analysis. They noted constraints in the state permit: work in the river must be delayed during critical spawning months (April 1 through July 31), that material gathering is allowed before April 1, and that the state permit expires Oct. 31, 2025. The commission approved the permit subject to the condition that the hydrologic and hydraulic analysis be completed and produce favorable results before any river work starts. The motion also recorded that neighboring property owner Jacob Anderson had offered to split the cost of the analysis.

Commissioners and the applicant discussed timing: the state engineer’s permit allows river work starting Aug. 1, and contractors estimated the in-river construction itself would take about two to three weeks if materials are staged; however, completing an independent hydrologic/hydraulic study could take several weeks to months depending on scope. The commission voted in favor by roll call.