Ladue Stormwater Needs Assessment, Master Plan and Design Projects

The City of Ladue’s Storm Water Management Program (SMP) is a comprehensive, three-phased initiative to alleviate various stormwater concerns in the community. The three phases of the SMP are: Phase I: Needs Assessment / Phase II: Master Plan / Phase III: Projects.

The goal of the “Needs Assessment” was to identify stormwater-related problems city-wide including the “health” of the natural streams. The deliverable from this phase was a comprehensive listing and mapping of the identified stormwater-related problems from all sources.

Subsequent to the completion of the Needs Assessment, HR Green completed a stormwater master plan for the project, which identified approximately 54 projects throughout the City to address stormwater needs of reduced flooding and improved infrastructure conditions. HR Green was also hired for the design of the two largest projects selected for implementation:

The Deerfield and Wakefield subdivisions are located in southeast Ladue. Little or no storm sewer infrastructure was constructed at the time of initial development, relying completely on sinkholes to drain the downstream end of the project area. Consequently, a number of highly valuable properties are prone to flooding and have experienced significant damage in recent years. The project is estimated to cost $10-million and is currently undergoing preliminary design, with construction anticipated to begin in 2022.

The Willow Hill and Loren Woods subdivisions are located in northeast Ladue. Most of the homes in these neighborhoods were constructed between 1930 and 1960. Little or no storm sewer infrastructure was constructed at the time of initial development. A limited storm sewer system was retrofitted into selected areas at a later date, but it does not meet today’s design standards. The project cost over $2-million with construction completed in Spring 2022.

“HR Green has established themselves as a trusted partner of the City. We value their critical role in the development and execution of our Stormwater Management Program, from initial needs assessment phase all the way through project design and construction. HR Green offers diverse expertise to tackle the unique stormwater challenges faced by municipalities today. We appreciate their responsiveness and devotion to providing a high level of Client service, so City staff can in turn provide a high level of service to our residents and stakeholders.”

– Director of Public Works, City of Ladue