[2022 AR] PRF Monitoring

2022 Report

PRF Monitoring


During 2022:

  • The Cottonwood Creek “treatment train”  as a whole reduced phosphorus and total suspended solids in base and storm flow conditions.
  • All nutrients were reduced upstream to downstream on McMurdo Gulch
  • PRF effectiveness was evaluated for significant changes over time and geospatially using the PRF statistical analysis tool available on the data portal.

The Cherry Creek Basin has multiple pollution reduction facilities (PRFs) in various locations through the watershed, most notably in Cottonwood Creek. Together, stream reclamation and wetland detention systems comprise a passive treatment train approach widely implemented by CCBWQA throughout the basin since the 1990s as an effective water quality strategy to reduce nutrients and sediments, especially during storm events.

The Cottonwood Treatment Train (Peoria Pond, Phases 1 and 2 of stream reclamation completed on Cottonwood Creek downstream, and the Perimeter Pond) showed statistically significant removal efficiencies for phosphorus (TP) and total suspended solids (TSS) when comparing concentrations from above (upstream) to below (downstream) of the Treatment Train during the last 10 years (2013-2022). Likewise, Peoria Pond also showed significant removal of TP and TSS upstream to downstream during storm flow conditions over the same time period. The Perimeter Pond PRF demonstrated significant reductions in TP, total nitrogen (TN), and TSS concentrations in base and storm flow. The McMurdo Gulch upstream to downstream concentration analysis demonstrated a statistically significant reduction of TP and TN, since monitoring began at those sites.

Summary of Reductions in Nutrient and Suspended Solids in CCBWQA PRFs, WY 2022*

◯ reductions of less than 25%, - reductions between 25-50%, ⚫ - reductions of >50%, blank cells indicate no reduction or an increase upstream to downstream

Cottonwood Creek PRFs


Learn More in the WY 2022 Monitoring Report

Useful Links

PRF Performance

Cottonwood Creek Treatment Train



Upstream to Downstream Concentrations Over Time



Net Change Over Time


Base Flow
Storm Flow

Percent Change Over Time


Base Flow
Storm Flow

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