The proposed project would replace an existing undersized covered concrete-lined channel with a new 8-foot by 5-foot concrete box culvert. The existing concrete-lined channel is undersized and upsizing is necessary to carry 100-year flood flows and reduce existing and future flood hazards. The new box culvert would be approximately 170 feet long; it would be installed parallel to and on the northern side of the existing concrete-lined channel in order to keep water flowing during construction. The box culvert would tie into an existing concrete arch culvert that flows under Main Street via a concrete transition structure. A new concrete headwall, approach, and riprap side walls would be provided at the inlet to transition the natural stream channel into the box culvert. Riprap would also be installed at the Main Street culvert outlet to prevent erosion.

Permanent impacts to Boles Creek would include approximately 0.01 acres, 50 cubic yards, and 59 linear feet. Temporary impacts would be approximately 0.04 acres and 122 linear feet. The proposed work would occur between May 1 and October 15.

All trees removed to facilitate project construction would be replaced upon completion of construction. Riparian tree species would be planted in all the riprap. Planting would occur at a minimum 3:1 ratio. The planted trees would be monitored on an annual basis for a minimum of five years or until the required minimum number of replacement trees is fully established, with no further need for human intervention. If the replacement trees die prior to becoming established, they would be replanted, and monitoring would continue until success is achieved.