February 2010 Middle Bear River and Cutler Reservoir Final TMDLs February 2010 Utah Department of Environmental Quality Division of Water Quality TMDL Section Cutler Reservoir TMDL EPA Approval Date: February 23, 2010 Waterbody ID UT-L-16010202-002 Location Cache County, Northern Utah Pollutants of Concern Low dissolved oxygen (DO) Excess total phosphorus Impaired Beneficial Uses Class 3B: Protected for warm water species of game fish and other warm water aquatic life, including the necessary aquatic organisms in their food chain Class 3D: Protected for waterfowl, shore birds and other water- oriented wildlife not included in Classes 3A, 3B, or 3C, including the necessary aquatic organisms in their food chain Current Load Southern Cutler Reservoir • Summer season: 71,201 kg TP/season • Winter season: 62,622 kg TP/season Northern Cutler Reservoir • Summer season: 127,402 kg TP/season • Winter season: 119,829 kg TP/season Loading Capacity Southern Cutler Reservoir • Summer season: 25,539 kg TP/season • Winter season: 28,986 kg TP/season Northern Cutler Reservoir • Summer season: 62,103 kg TP/season • Winter season: 63,461 kg TP/season Margin of Safety Southern Cutler Reservoir • Summer season: 1,277 kg TP/season • Winter season: 1,449 kg TP/season Northern Cutler Reservoir • Summer season: 3,105 kg TP/season • Winter season: 3,171 kg TP/season Future Load Allocation Southern Cutler Reservoir • Summer season: 213 TP/season • Winter season: 0 kg TP/season Northern Cutler Reservoir • Summer season: 356 TP/season i Middle Bear River and Cutler Reservoir Final TMDLs February 2010 • Winter season: 0 kg TP/season Load Allocations (WLAs + Southern Cutler Reservoir LAs) Carried over from • Summer season: 3,121 kg TP/season Existing TMDLs • Winter season: 2,877 kg TP/season Northern Cutler Reservoir • Summer season: 23,603 kg TP/season • Winter season: 21,426 kg TP/season New WLA Identified for Southern Cutler Reservoir Cutler Reservoir TMDL • Summer season: 4,807 kg TP/season • Winter season: 12,569 kg TP/season Northern Cutler Reservoir • Summer season: 5,063 kg TP/season • Winter season: 13,151 kg TP/season New Load Allocation (LA) Southern Cutler Reservoir Identified for Cutler Reservoir • Summer season: 16,121 kg TP/season TMDL • Winter season: 12,091 kg TP/season Northern Cutler Reservoir • Summer season: 29,976 kg TP/season • Winter season: 25,713 kg TP/season Defined Targets/Endpoints Dissolved Oxygen (DO) • 1-day min DO of 3.0 mg/L throughout the water column • 7-day average DO to be maintained above 4.0 mg/L • 30-day average DO to be maintained above 5.5 mg/L Total Phosphorus • Total phosphorus concentration of no more than 0.075 mg/L at Cutler Dam outfall throughout the year • Mean seasonal (May–October) total phosphorus concentration of less than 0.07 mg/L in the Northern Reservoir • Mean seasonal (May–October) total phosphorus concentration of less than 0.09 mg/L in the Southern Reservoir Watershed Nonpoint Sources Canal discharge and return flow from lands irrigated with municipal WWTP effluent Stormwater runoff On-site wastewater treatment systems (septic systems) Animal feeding operations and confined animal feeding operations Runoff from agricultural and pasture lands Cattle in streams, riparian areas, and reservoir shoreline Runoff from forested lands Runoff form rangelands Seasonal internal reservoir sources Pipes discharging into Cutler Reservoir and tributaries Stream erosion and reservoir shoreline erosion Natural background sources Regulated Point Sources Logan Regional Wastewater Treatment Plant Newly Addressed in Cutler Fisheries Experiment Station Reservoir TMDL ii Middle Bear River and Cutler Reservoir Final TMDLs February 2010 Regulated Point Sources JBS Swift and Company (formerly EA Miller; Spring Creek TMDL) Included in Tributary TMDLs Hyrum WWTP (Spring Creek TMDL) Miller Brothers Feedlot (Spring Creek TMDL) Arambel Dairy (Spring Creek TMDL) Wellsville Lagoons (Little Bear River TMDL) Northern Utah Manufacturing (Little Bear River TMDL) Trout of Paradise 001(Little Bear River/Hyrum Reservoir TMDLs) Trout of Paradise 002 (Little Bear River/Hyrum Reservoir TMDLs) Lewiston Lagoons (Cub River TMDL) Casper Ice Cream (Cub River TMDL) Richmond Lagoons (Cub River TMDL) Montpelier, ID WWTP (Idaho Bear River TMDL) Soda Springs, ID WWTP (Idaho Bear River TMDL) Grace, ID WWTP (Idaho Bear River TMDL) Preston, ID WWTP (Idaho Bear River TMDL) Franklin, ID WWTP (Idaho Bear River TMDL) Clear Springs Foods, ID (Idaho Bear River TMDL) Grace Fish Hatchery, ID (Idaho Bear River TMDL) Bear River Trout Farm, ID (Idaho Bear River TMDL) iii Middle Bear River and Cutler Reservoir Final TMDLs February 2010 This page intentionally blank. iv Middle Bear River and Cutler Reservoir Final TMDLs February 2010 Utah Department of Environmental Quality Division of Water Quality TMDL Section Middle Bear River TMDL EPA Approval Date: Waterbody ID UT16010202-004 Location Cache County, Northern Utah Pollutants of Concern Low dissolved oxygen Excess total phosphorus Impaired Beneficial Uses Class 3B: Protected for warm water species of game fish and other warm water aquatic life, including the necessary aquatic organisms in their food chain Current Load Summer season: 46,593 kg TP/season Winter season: 44,482 kg TP/season Loading Capacity Summer season: 29,578 kg TP/season Winter season: 28,361 kg TP/season Margin of Safety Summer season: 1,109 kg TP/season Winter season: 1,064 kg TP/season Future Load Allocation Summer season: 89 kg TP/season Winter season: 0 kg TP/season Load Allocations (WLAs + Summer season: 20,439 kg TP/season LAs) Carried over from Winter season: 18,511 kg TP/season Existing TMDLs New WLAs Identified for Summer season: 256 kg TP/season Cutler Reservoir TMDL Winter season: 554 kg TP/season Revised Load Allocation (LA) Summer season: 7,685 kg TP/season Identified for Middle Bear Winter season: 8,232 kg TP/season River TMDL Defined Targets/Endpoints Dissolved Oxygen (DO) • 1-day min DO of 3.0 mg/L throughout the water column • 7-day average DO to be maintained above 4.0 mg/L • 30-day average DO to be maintained above 5.5 mg/L Total Phosphorus • Total phosphorus concentration of no more than 0.05 mg/L throughout the year v Middle Bear River and Cutler Reservoir Final TMDLs February 2010 Watershed Nonpoint Sources Stormwater runoff On-site wastewater treatment systems (septic systems) Animal feeding operations and confined animal feeding operations Runoff from agricultural and pasture lands Cattle in streams, riparian areas, and reservoir shoreline Runoff from forested lands Runoff form rangelands Stream erosion Natural background sources Regulated Point Sources Lewiston Lagoons (Cub River TMDL) Included in Tributary TMDLs Casper Ice Cream (Cub River TMDL) Richmond Lagoons (Cub River TMDL) Montpelier, ID WWTP (Idaho Bear River TMDL) Soda Springs, ID WWTP (Idaho Bear River TMDL) Grace, ID WWTP (Idaho Bear River TMDL) Preston, ID WWTP (Idaho Bear River TMDL) Franklin, ID WWTP (Idaho Bear River TMDL) Clear Springs Foods, ID (Idaho Bear River TMDL) Grace Fish Hatchery, ID (Idaho Bear River TMDL) Bear River Trout Farm, ID (Idaho Bear River TMDL) vi Middle Bear River and Cutler Reservoir Final TMDLs February 2010 Table of Contents TABLE OF CONTENTS ................................................................................................................................ vii LIST OF APPENDICES ................................................................................................................................. xii LIST OF TABLES ........................................................................................................................................ xiii LIST OF FIGURES ..................................................................................................................................... xvii FOREWORD .................................................................................................................................................. 1 ACKNOWLEDGMENTS .................................................................................................................................. 1 PREPARERS .................................................................................................................................................. 2 DATA CONTRIBUTORS ................................................................................................................................. 2 DOCUMENT REVIEWERS ............................................................................................................................. 3 CHAPTER 1 INTRODUCTION .......................................................................................................... 5 1.1 Purpose ..................................................................................................................................... 5 1.1.1 The Total Maximum Daily Load Process ........................................................................ 6 1.1.1.1 Point Sources ................................................................................................................ 6 1.1.1.2 Nonpoint Sources .......................................................................................................... 6 1.1.1.3 Load Allocations ........................................................................................................... 6 1.1.2 Why Should TMDLs Be Written? ................................................................................... 7 1.1.3 Who