US Army Corps of Engineers
Albuquerque District Website

BOR, San Ildefonso Pueblo, Bank Stabilization SPA-2012-00442-ABQ

Published Nov. 20, 2012
Expiration date: 12/19/2012

The U.S. Army Corps of Engineers, Albuquerque District, (Corps) is evaluating a permit application to construct the Bureau of Reclamation (BOR), San Ildefonso Pueblo, Rio Grande, Bendway Weirs, Point Bar Removal Project in Santa Fe County, NM, which would result in impacts between approximately 1.2 to 1.8 acres (maximum) or approximately 850 linear feet of waters of the United States and/or navigable waters of the United States in or adjacent to Rio Grande.  In addition, approximately 0.248 acre of wetlands will be permanently impacted by the proposed project.  This notice is to inform interested parties of the proposed activity and to solicit comments. 

AUTHORITY: This application is being evaluated under Section 404 of the Clean Water Act for the discharge of dredged or fill material in waters of the United States (U.S.).

APPLICANT: Mr. Mike Hamman

                        Bureau of Reclamation

                        Albuquerque Area Office

                        555 Broadway Blvd. NE, Suite 100

                        Albuquerque, New Mexico  87102 

AGENT:         Ms. Lori Walton

                         Bureau of Reclamation

                        Albuquerque Area Office

                        555 Broadway Blvd. NE, Suite 100

                        Albuquerque, New Mexico  87102 

LOCATION: The project site is located on or near Rio Grande, Section 7, Township 19 N, Range 8 E, Latitude 35.89408°N, Longitude -106.12833°W, San Ildefonso Pueblo , Santa Fe County, New Mexico (see Sheets 1 and 2 of 7). 

PROJECT DESCRIPTION: The applicant proposes to construct seven rock riprap bendway weirs for bank stabilization and the removal of the west bank point bar to alter existing channel flows (see Sheet 3 of 7).  Based on the available information, the overall project purpose is to stop ongoing bank erosion that threatens the San Ildefonso Pueblo's fishing pond and the berm access road.  The applicant states that Pueblo wishes to protect the existing fishing pond and to prevent the eventual erosion of the 2007 bendway weirs which would make them ineffective to protect the pueblo’s fishing pond.   

Installation of additional bendway weirs is the primary erosion protection aspect of the project and includes the following: excavation from the west point bar, installation of seven additional bendway weirs along the east bank to extend bank protection along the entire length of the river bend, creation of a floodplain bench along the east bank, and willow pole planting on the new floodplain bench surface.   

The goal of the new bendway weirs is to move the deepest part of channel (thalweg) away from the east bank and thereby removing the most severe hydraulic forces away from the eroding east bank. Scour at the weir tips will move the thalweg to this alignment toward the west bank while flow velocities are greatly reduced near the east eroding bank. New bendway weirs will also encourage a less abrupt bend alignment to counteract the lateral migration trend and promote long term stability at the site. 

In conjunction with the bendway weir placement, material excavated from the existing point bar will be used as fill along the toe of the east bank (see Sheets 4 and 5 of 7).  The excavation will widen the main channel to the west, offsetting any narrowing caused by the bendway weirs.  The east floodplain has become disconnected from the river in the area of the project due to channel incision, so the fill material will provide an inner floodplain surface to be inundated during typical spring runoff flows (above 3,500 cfs).

Comments and requests for additional information should be submitted to:

            William Oberle, Project Manager

            US Army Corps of Engineers, Albuquerque District

            4101 Jefferson Plaza NE

            Albuquerque, NM 87109-3435

            505-342-3284

            FAX 505-344-1514

            E-mail: William.M.Oberle@usace.army.mil

To view the entire Public Notice click here.

To view the Maps and Drawings click here.