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South Platte River Urban Waters Partnership previews data tools, USGS sampling and funding outlook
Summary
At a March 25 committee meeting, Samuel Wallace, South Platte River Urban Waters Partnership ambassador, showed a new water-quality assessment tool, summarized a May 2025 USGS high-flow sampling run and said USGS will sample low-flow conditions in September 2026; Wallace also described grants, outreach plans and recent federal funding cuts offset in part by Aurora Water and Denver Water.
Samuel Wallace, the South Platte River Urban Waters Partnership ambassador, briefed the Denver City Council's South Platte River Committee on March 25 about the partnership's mission, a newly developed water-quality assessment tool and recent and planned U.S. Geological Survey sampling aimed at pinpointing pollutant sources along the South Platte River.
Why it matters: Wallace said the partnership's interactive tool and the USGS longitudinal work seek to make monitoring data easier to access, spot pollution "hot spots" and guide locally relevant solutions for algal blooms, nutrient pollution and other water-quality concerns that affect recreation and aquatic habitat.
Wallace described the South Platte River Water Quality Assessment Tool as a dynamic visualization platform that pulls nightly updates from the Colorado Data Sharing Network and the EPA National Water Quality Portal. He said the tool offers both a map of monitoring locations and a sub-watershed explorer that aggregates stations for trend analysis; Wallace showed an example plotting total phosphorus at a monitoring site near 88th Avenue.
Wallace explained the USGS's earlier 2020 longitudinal study followed…
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