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 updating this document to better illustrate the priority areas identified through 2022. Targets for TMDL development for 2016 and 2017 were identified in the 2016 Integrated Report and are listed below.

2015 draft TMDL Prioritization Strategy

TMDLs and Alternative Restoration Plans in 2022 and 2023
Waterbody AUID
Target Year
COARMA12_A Huerfano River Se 2022

Arkansas River, Colorado Canal to John Martin Reservoir

Se 2022
COARLA04a_A,B Apishapa River, Timpas Creek Se 2022

Tributaries to Arkansas River, and Chicosa Creek

Se 2022
COARLA09b_B Big Sandy Creek Se 2022
COSPBE01C_A Bear Creek Reservoir P, chl-a 2022
COSPBE02_C Bear Creek below Kipling Parkway E. coli 2023
COARUA15_A DeWeese Reservoir Do and P 2023
COSPCP12_A Cache la Poudre River E. coli 2023
COSPCP13a_D,E Fossil Creek, Spring Creek E. coli 2023
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 2023
COSPCL02c_B Turkey Gulch Cd, Zn, Cu, Fe, Mn, Ni 2023
COSPCL03b_A Leavenworth Creek Cd, Cu 2023
COSPCL05_B West Fork of Clear Creek Cu 2023
COSPCL06_C North Empire Creek Cd, Zn, Cu, Fe, Mn, Ni,
COSPCL09a_B Silver Creek Pb, Cu 2023
COSPCL09a_C Fall River Zn 2023

Chicago Creek, mainstem and all tributaries

Cu 2023
COSPCL12a_B Gilson Gulch and tribs Cd, Cu, Fe, Pb, Mn, Ni, Zn 2023

Gregory, Russell, Silver Gulches and tribs

Cd 2023