Matrix provided engineering design and construction support services to Colorado Springs Utilities (“Utilities”) to stabilize an approximate 4,450’ reach of Monument Creek near the Pikeview Diversion in Colorado Springs. In implementing a vigorous channel and floodplain restoration, Matrix assisted Utilities in achieving multiple objectives that included infrastructure protection, MS4 compliance, erosion reduction and wildlife habitat enhancement.
Matrix worked with Utilities staff to develop an approach that combined conventional channel stabilization techniques with natural channel design elements. Prior to design, Matrix conducted an analysis to assess stream morphology, critical design flows, and reach hydraulics to develop design parameters tailored to the project. Our Team designed a series of modified, partial-width sculpted concrete drop structures, constructed riffles, and a W-weir boulder vane for grade control. A vegetated bankfull bench with grouted boulder edging was used to protect a vertical sandstone cliff within the project reach. Over 30,000 cubic yards of earthen material was imported from the Utilities’ US 85/87 facility to bring the channel thalweg up and reestablish functional floodplain connectivity.
Matrix also provided a wetland design for the project, including an irrigation diversion that was incorporated into one of the sculpted concrete drop structures. The riparian revegetation plan included wetland/riparian plantings, imported topsoil, biodegradable erosion control fabric and over 20,000 willow plantings. In addition to design and construction support services, Matrix completed CLOMR/LOMR permitting services for floodplain impacts and Army Corps of Engineers 404 permitting incidental to the project improvements.