Total Maximum Daily Load (TMDL)
DEQ manages the Total Maximum Daily Load (TMDL) program for the State of Oklahoma. A TMDL is the process of establishing the sources of impairment in a given waterbody, whether from point sources (discharges) or non-point sources (runoff), determining the amount of reduction necessary to meet water quality standards in that waterbody, and allocating the loads to the various contributors of pollution. A margin of safety is also included in the TMDL calculation process.
Water quality modeling is the linkage between the sources of pollution and the instream water quality of a given waterbody. A model is a representation of the water-quality processes that occur in a given waterbody. Water quality modeling can be resource-intensive. Different levels of complexity may be used depending on the level of confidence required in a given situation.
Lake Oologah Draft TMDL Report and Public Notice
The Lake Oologah Draft TMDL is open for Public Comment through 4:30 pm on Friday, December 29, 2023.
Please submit comments in writing to: Soojung Lim, Water Quality Division, Oklahoma Department of Environmental Quality, PO Box 1677, Oklahoma City, OK 73101-1677
or by email at Water.Comments@deq.ok.gov
Public Notice for the Lake Oologah Draft TMDL
Lake Oologah Draft TMDL Report
Appendix A – Data Acquisition and Assessment
Appendix B – Watershed Model Calibration and Validation Report
Appendix C – EFDC Hydrodynamic and Water Quality Model
Appendix D – Oklahoma Antidegradation Policy
Appendix E – Water Withdrawals in Verdigris River Basin
Appendix F – Sanitary Sewer Overflow Bypass Events
Appendix I – Ambient Monitoring Data at Watershed and Lake Stations
Appendix J – Stormwater Permitting and BMPs
Waterhole Creek and Lukfata Creek Draft TMDL and Public Notice
The Waterhole Creek and Lukfata Creek Draft TMDL is open for Public Comment through 4:30 pm on Friday, December 1, 2023.
Please submit comments in writing to: Nicole Newcomer, Water Quality Division, Oklahoma Department of Environmental Quality, PO Box 1677, Oklahoma City, OK 73101-1677
or by email at Water.Comments@deq.ok.gov
Waterhole Creek and Lukfata Creek Draft TMDL Public Notice – Comment Period ends Friday, December 1, 2023
Waterhole Creek and Lukfata Creek Draft TMDL Report
Fort Gibson Lake TMDL
Public Notice for the Fort Gibson Lake Draft TMDL
Fort Gibson Lake Draft TMDL Report
Appendix A – HSPF Watershed Model
Appendix C – Antidegradation Policy
Appendix D – Ambient Monitoring Data
Appendix E – Stormwater Permitting and BMPs
Appendix F – SSO Bypass Events
Appendix I – Distributions for Maximum Daily Loads
Fort Gibson Lake 208 Factsheet
Contact Watershed Planning
An interactive map of Oklahoma’s waterbodies is available at http://gis.deq.ok.gov/maps/.