Rio Grande near Alamosa, CO – RGHRP

April 2016 Public Meeting in Sanford, CO


RGHPThe Rio Grande Headwaters Restoration Project and its outgrowth, the Colorado Rio Grande Restoration Foundation is interested in finding ways to improve the historical functions of the headwaters of the Rio Grande in Colorado. A river condition assessment was completed in 2001 of the first 91 miles (from the upstream town limits of South Fork to the Alamosa – Conejos County line) which resulted in a priority list of projects which are being done in phases. The first four phases have been completed, and more in planning and design phases. Also, Riverbend engineering has done a condition assessment study of the last ~35 miles from below the Alamosa Wildlife Refuge to the Colorado-New Mexico state line–download the 2016 final report here.

In the top study area (91 miles) The characteristics of the river are similar in all locations: low gradient, fine grained sediments, active bank erosion and limited woody riparian vegetation. And so, the restoration goals are similar at all of the sites: reduce bank erosion and improve riparian vegetation. By doing so, the health of the river is improved with better shade, reduced water temperatures, improved depth, better continuity of sediment movement and improved riparian habitat. The approach is to 1) flatten the river’s radius of curvature where the curvature gets too small; 2) install rock structures (rock deflectors) on the outside of the re-aligned bends that will resist lateral channel migration and reduce shear stress in the near bank region; and 3) encourage the establishment of a dense riparian vegetation colony on a new floodplain bench on the outside of these same meander bends, so that the vegetation can control the long-term bank stability and rate of erosion/lateral channel migration.