River Des Peres – Southwest Branch

Water Quality Improvement Project

II         Background

The City of University City has been awarded a grant from the Missouri Department of Natural Resources (the department), Division of Environmental Quality, Water Protection Program (WPP). This grant is to protect and improve the quality of water entering of the River Des Peres by identifying and implementing systems to prevent nonpoint source contaminants throughout the watershed from entering the receiving tributaries.  The grant funds 60 percent of the total project costs; the City match is 40 percent of the total project costs.

The River Des Peres watershed is a 114 square-mile area. The River Des Peres is listed on the 2002 303(d) list for low dissolved oxygen (DO), with the source of impairment being urban nonpoint sources. The river extends approximately 20 miles through St. Louis County and the City of St. Louis before discharging into the Mississippi River. The University City branch of the watershed encompasses 8,200 acres in east central St. Louis County. Land in the watershed falls in hydrologic unit code (HUC) 07140101070003 and is almost completely developed. One third of the watershed area is within University City's jurisdiction. University City has a population of approximately 40,000 residents with diverse religious, ethnic and racial backgrounds. 

Two segments of the river that are on the 303(d) list are in HUC 07140101070003, one going through University City and the other within the City of St. Louis boundary. The impaired segments of the River Des Peres are not classified waters because they only flow during storm events and do not maintain pools that support aquatic life. The classified portion of the River Des Peres is within HUC code 0714010107004 and is the downstream-most 2.5 miles of the river, which is approximately 12 miles downstream of a USGS sampling site. The project area focuses on the River Des Peres segments within University City.  

Part of the project area is in Ruth Park Woods which has a mulch pile processing site, and Ruth Park Golf Course located along Olive Blvd, east ofI-170. The southwest branch tributary runs from west to east for approximately 2,500 feet along the northern edge of the study-area between McKnight Rd. and Olive Blvd. The river is conveyed in a concrete channel upstream of the project area and enters a culvert just downstream of the project area. The left bank is nearly vertical, devoid of vegetation with an apparent scour line at higher flows. The right bank is steep and over 25 feet high. It has little vegetation with fallen mature trees up to one foot in diameter at breast height. Severe erosion is evident on both slopes.  

Water quality degradation to the River Des Peres project area could be affected by on-site factors such as stream bank erosion, rill and gully erosion, and contamination from the mulch pile and golf course. Off-site factors include upstream residential areas and businesses, combined sewer overflows and stormwater created by a large impervious area.  

III        Objectives

The major goal of the project is to protect and improve the quality of water entering of the River Des Peres by identifying and implementing systems to prevent nonpoint source contaminants throughout the watershed from entering the receiving tributaries. This will be accomplished through specific objectives as follows:

Education:

1.      To reduce the pollutant load to the river by educating 40,000 residents, 500 businesses and 300 city employees about preventive measures that can reduce or prevent NPS pollutants that they can control from reaching the river. A dedicated insert in the University City Newsletter, which will be published quarterly and will be distributed to 40,000 residents and businesses in the area. Copies will also be distributed to and 500 developers, businesses and residents through the City's Planning and Development and Public Works office that will follow the progress of the project. As part of the project the newsletter will give recognition to landowners participating in the project.

2.      Exhibits will rotate through local places of interest and public facilities such as the public library, University City Loop, Olive Business District, the Green Center, City Hall, University City Recreation Center and local schools. This will consist of freestanding display that will have photos, articles, and descriptions of what individuals can do to clean up the River Des Peres. The information on these boards will be updated quarterly and include progress of the project.

3.      As part of the education process the City will provide demonstration tools and training aids for residents, students, businesses, the general public and interested parties, other municipalities, engineers, landscapers and developers about preventing, controlling and/or abating nonpoint source water pollution.

4.      Presentations to community groups that would be interested in the project.

5.      A dedicated webpage with links to other partners that describes the overall goals of the project, and the project progress will be established on the city's web site.

6.      Develop and install signs to advertise and educate the public about the project.

Demonstration:

7.    To provide a test site to evaluate various bioremediation techniques that can be used to improve water quality, and to determine which techniques work best so they can be used throughout the watershed. Bioremediation, bio-swales, detention ponds, grass filters and stream bank stabilization practices are some of the practices that may be implemented. Assessments will be conducted before and after installation to evaluate effectiveness along with photos and site reports.

8.   To implement a demonstration project with up to three residential properties within the project area that shows homeowners how to reduce stormwater runoff that contributes to erosion and sedimentation.

Monitoring:

9.   To identify which and where NPS contaminants are entering the River Des Peres through testing and monitoring at least 4 segments of the river over the four year project period which can be used for before and after comparison of impacts of the project on water quality.

10.  To provide planning, design, operation and maintenance narratives on efficacy of BMP practices and/or BMP systems, construction plans, and monitoring that is completed in the watershed for practices that do not have established standards and specifications.

Implementation:

11.  Implement and test selected best management practices (BMPs) to help restore and maintain some of the watershed's original characteristics and prevent future degradation of habitat and water quality.

12.  To use the Ecosystem Management Plan for Ruth Park Woods as a guide to determine site location and which BMPs will be best for implementation.