Walnut Creek Watershed

The Walnut Creek Watershed stretches 83 square-miles across Polk and Dallas counties, divided nearly evenly across rural and urban areas. Following a decade where more than six square miles of the watershed developed into urban land uses, Walnut Creek continues to be one of the fastest urbanizing areas in Iowa. As the watershed changed, so did the environmental conditions.

Flooding, nutrient loading, bacteria and eroded soils impact public health, reduce habitat, and undermine the ability of Walnut Creek to serve as a Central Iowa amenity. Walnut Creek flows into the Raccoon River less than a mile from the Des Moines Water Works’ intake for public water supply serving nearly one and a half million users. Walnut Creek is a priority area to focus restoration efforts, which is why The Walnut Creek Watershed Management Authority is working to collaboratively address watershed issues.

A Brief History Of Walnut Creek Watershed

Watershed Areas of Focus

To address watershed issues, you must first understand what is happening within the watershed and creek. Key elements to understand include:

Watershed Geography

Learn More

Climate and Streamflow

Learn More

Characteristics of the Stream

Learn More

Key Pollutants and Sources

Learn More


The Watershed Management Authority meets quarterly to discuss watershed issues and potential solutions. Here you can find these meeting agendas and minutes, which can be downloaded at your convenience.

Monthly Updates

Meeting Notes

Below Are Archived Walnut Creek Meeting Notes & Agenda

The Walnut Creek Watershed Management Authority was formed in 2014