The Pleasant View Road Channel Improvement project is complete! The newly planted vegetative cover on the slopes must grow before the erosion control measures can be removed. The city partnered with Riley Purgatory Bluff Creek Watershed District on this project to stabilize the area and help prevent the sediment from the eroding hillside from entering the lake. Check out the pictures to see the final result!

The city had been monitoring an area of erosion and sedimentation due to stormwater runoff adjacent to Lotus Lake, abutting 489 Pleasant View Road. The site has experienced an acceleration of erosion, leading to the undercutting of an embankment, the scouring of a ravine, and the undermining of mature trees.

The city knew the need for stormwater improvements near Lotus Lake abutting 489 Pleasant View Road. The issue arose due to the overland stormwater or sheet flow that had been eroding and undercutting an embankment supporting Pleasant View Road. Observations in 2017 found that the problem had accelerated, and staff determined that the need for repairs and erosion mitigation could not wait until the scheduled CIP date. Due to the severity of the erosion and potential hazards to Pleasant View Road and Lotus Lake, the city decided the project needed to be completed in the summer of 2020. The construction was outside of the school year so as not to impact school buses. The city coordinated this work with stakeholders, including the property owner and Riley Purgatory Bluff Creek Watershed District (RPBCWD).

The Pleasant View Road Drainage Improvement Project (Project No. 19-04) included:

• The removal of old and failing storm pipes.
• The installation of two new pre-cast concrete storm structures.
• The installation of new reinforced concrete pipes.

The failed and eroded areas were also restored and stabilized, and a rock channel leading to the lake was constructed. These improvements will help ensure that the stormwater runoff will be appropriately conveyed to Lotus Lake, with the additional benefit of reducing total suspended solids (TSS) and other pollutants.

Overview

The City has partnered with the Riley Purgatory Bluff Creek Watershed District to improve and stabilize a ravine that flows into Silver Lake.

The project is located in northeast Chanhassen, off of Pleasant View Road in Pleasant View Preserve. The project involves ravine stabilization and improvements, including check dams leading into Silver Lake. The check dams will be reinforced with iron-enhanced sand filters. As the water filtrates in the check dam, the iron in the sand allows for additional phosphorus removal from the stormwater.

Additionally, the project would include minor street and stormwater improvements to Pleasant View Road adjacent to the ravine. The project's overall goal is to stabilize the eroded ravine, reduce phosphorus loading, and thus improve the water quality in Silver Lake.