Park City Mountain Resort Erosion Control and Gully repair Project

treaure_hollow_003The Treasure Hollow ski run on the Park City Mountain Resort was one of the first ski runs constructed by Park City Ski Area in the 1960’s. Over the course of time a significant erosion gully has developed. In 1998, the lower 2000 feet of the gully was repaired and snowmelt runoff directed to a rock lined channel, constructed by the resort. In 2003, as a result of the East Canyon Creek Water Quality Committee Water Quality Improvements Project report and the Park City Mountain Resort Watershed Restoration and Protection Strategy (WRAPS), the upper reaches of the gully in Treasure Hollow was identified as a contributor to sedimentation of tributaries of East Canyon Creek.

treaure_hollow_006In response to these reports, in October of 2005 Park City Mountain Resort re-graded the existing gully and constructed a stabilized runoff channel using channel reinforcement mat and slope stabilization fabric. The runoff channel will discharge to the existing rock lined channel in the lower reaches of Treasure Hollow run. The entire ski run area adjacent to the new channel was smoothed and re-vegetated. Water bars were installed and directed to the new stabilized channel.

To complete the project, two existing drop structures and basins, constructed as part of the Lower Treasure Hollow project, will be rehabilitated. The current outlets of the basins are damaged from runoff and the basin side slopes are eroding into the basin, greatly reducing their effectiveness. Rehabilitation will consist of placement of erosion control fabric and reseeding of the basin side slopes and reconstruction of the outlet weirs. This is schedule to be completed in 2006.

treaure_hollow_007Based upon the project channel construction strategy, a Revised Universal Soil Loss Equation calculation was performed. The calculated soil loss from existing conditions is 780 tons per year. The calculated soil loss after construction is calculated to be 460 tons per year, or an approximately 69% reduction.

Total project cost is estimated at $65,000. Working with Lee Duncan, the local watershed coordinator, the Resort will receive 60%, or $39,000, of the project cost from an EPA 319 Clean Water Act grant.