TMDL prioritization

As part of a new national vision for the CWA 303(d) program states were required to identify priority areas for TMDL development through 2022. Colorado submitted priority areas to EPA in the fall of 2015. The draft strategy document outlines the approach used to determine priority areas. 

The division is currently working on completing TMDLs that were prioritized during the last vision cycle. Targets for TMDL development for 2024 and 2025 are listed below.

2015 draft TMDL Prioritization Strategy

TMDLs and Alternative Restoration Plans in 2024 and 2025
Waterbody AUID
Target Year
COARMA12_A Huerfano River Se 2024

Arkansas River, Colorado Canal to John Martin Reservoir

Se 2024
COARLA04a_A,B Apishapa River, Timpas Creek Se 2024

Tributaries to Arkansas River, and Chicosa Creek

Se 2024
COARLA09b_B Big Sandy Creek Se 2024
COSPBE01C_A Bear Creek Reservoir P, chl-a 2024
COSPBE02_C Bear Creek below Kipling Parkway E. coli 2025
COARUA15_A DeWeese Reservoir Do and P 2025
COSPCP12_A Cache la Poudre River E. coli 2025
COSPCP13a_D,E Fossil Creek, Spring Creek E. coli 2025
COARLA01c_A Arkansas River, John Martin Reservoir Outlet to Colorado/Kansas state line Se (alternative
restoration plan)
COSPCL02a,b,c_B,C,F Mainstem of Clear Creek and tribs Cd, Zn 2025
COSPCL02c_B Turkey Gulch Cd, Zn, Cu, Fe, Mn, Ni 2025
COSPCL03b_A Leavenworth Creek Cd, Cu 2025
COSPCL05_B West Fork of Clear Creek Cu 2025
COSPCL06_C North Empire Creek Cd, Zn, Cu, Fe, Mn, Ni,
COSPCL09a_B Silver Creek Pb, Cu 2025
COSPCL09a_C Fall River Zn 2025

Chicago Creek, mainstem and all tributaries

Cu 2025
COSPCL12a_B Gilson Gulch and tribs Cd, Cu, Fe, Pb, Mn, Ni, Zn 2025

Gregory, Russell, Silver Gulches and tribs

Cd 2025