2b. Mainstem of Fountain Creek from a point immediately above the State Highway 47 Bridge to the confluence with the Arkansas River.

September 1998 Reg 32 RMH (32.28(12))

2018 -- Reviewed, no change (32.61(H)); 2013 -- changed from 5280 µg/L to 3300 µg/L (32.52(N)); 2007 -- no change, but changes were proposed by the division; 2002 -- changed from 5100 to 5280 (32.34(F)); 1998-- original adoption 5100 µg/L (32.28(12))

2b. Mainstem of Fountain Creek from a point immediately above the State Highway 47 Bridge to the confluence with the Arkansas River.

June 2007 Reg 32 RMH (32.40(U))

Feasibility of selenium and sulfate load reductions

2018 -- Reviewed, no change (32.61(H)); 2013 -- Reviewed, no change (32.52(N)); 2007 -- original adoption 28.1 µg/L (32.40(U))

2b. Mainstem of Fountain Creek from a point immediately above the State Highway 47 Bridge to the confluence with the Arkansas River.

June 2007 Reg 32 RMH (32.40(U)); September 1998 Reg 32 RMH (32.28(12))

Feasibility of selenium and sulfate load reductions

2018 -- Reviewed, no change (32.61(H)); 2013 -- Reviewed, no change (32.52(N)); 2007 -- changed from ambient irreversible 490 mg/L to ambient feasibility-based 485 mg/L (32.40(U)); 2002 -- no change (32.34(F)); 1998-- original adoption 490 mg/L (32.28(12))

6. Mainstem of Monument Creek, from the boundary of National Forest lands to the confluence with Fountain Creek.

SSS apply to the subsegment of Monument Creek from immediately above the TriLakes Wastewater Treatment Facility to the North Gate Boulevard Bridge; TVS apply elsewhere.

Cu FMB(ac)=28.4μg/L

Cu FMB(ch)=17.8μg/L

2018 -- Reviewed, no change (32.61(H));

Previously adopted WER-based temp mod in 2004 RMH and current condition temp mod in 2006 RMH

1a. Mainstem of the Arkansas River from a point immediately above the confluence with Fountain Creek to immediately above the Colorado Canal headgate near Avondale.

2018 -- Reviewed, no change (32.61(H)); 2013 -- changed from 2765 µg/L to 2800 µg/L (32.52(N)); 2007 -- changed from 1600 µg/L to 2765 µg/L (not mentioned in SBP?); 2002 changed from 1900 to 1600 µg/L (32.34(F)); 1998 -- changed from 1400 to 1900 µg/L (32.28(6)); original adoption in 1989 -- Segment 1 had Fe = 1400 mg/L (32.15(D)

1a. Mainstem of the Arkansas River from a point immediately above the confluence with Fountain Creek to immediately above the Colorado Canal headgate near Avondale.

September 1998 Reg 32 RMH (32.28(6))

2018 -- Reviewed, no change (32.61(H)); 2013 -- Reviewed, no change (32.52(G and N)); 2007 -- changed from TVS to acute = 19.1 µg/L and chronic = 14.1 µg/L (32.40(U)); 2002 -- changed from 17 µg/L chronic to TVS (32.34(B)); 1998 -- original adoption 17 µg/L chronic (32.28(6))

1a. Mainstem of the Arkansas River from a point immediately above the confluence with Fountain Creek to immediately above the Colorado Canal headgate near Avondale.

2018 -- Reviewed, no change (32.61(H)); 2013 -- Reviewed, no change (32.52(G and N)); 2007 -- changed from 287 mg/L to 329 mg/L (32.40(U)); 2002 -- changed from 310 to 287 mg/L (32.34(F)); 1998 -- changed from 1400 to 310 mg/L (32.28(6)); 1995 -- changed from 1800 to 1400 mg/L; original adoption in 1989 -- Segment 1 had sulfate = 1800 mg/L (32.15(D))

1a. Mainstem of the Arkansas River from a point immediately above the confluence with Fountain Creek to immediately above the Colorado Canal headgate near Avondale.

2018 -- Reviewed, no change (32.61(H)); adopted in 2013 (32.52(K))

1b. Mainstem of the Arkansas River from the Colorado Canal headgate to the inlet to John Martin Reservoir.

2018 -- Reviewed, no change (32.61(H)); 2013 -- Reviewed, no change (32.52(G and N)); 2007 -- changed from 2000 to 1950 µg/L (not mentioned in SBP?); 2002 -- changed from 1900 to 2000 µg/L (32.34(F)); 1998 -- changed from 1400 to 1900 µg/L (32.28(6)); original adoption in 1989 -- Segment 1 had Fe = 1400 mg/L (32.15(D)

1b. Mainstem of the Arkansas River from the Colorado Canal headgate to the inlet to John Martin Reservoir.

2018 -- Reviewed, no change (32.61(H)); 2013 -- Reviewed, no change (32.52(G and N)); 2007 -- changed from 1078 to 902 mg/L (not mentioned in SBP?); 2002 -- changed from 1090 to 1078 mg/L (32.34(F)); 1998 -- changed from 1400 to 1090 mg/L (32.28(6)); 1995 -- changed from 1800 to 1400 mg/L; original adoption in 1989 -- Segment 1 had sulfate = 1800 mg/L (32.15(D)

1c. Mainstem of the Arkansas River from the outlet of John Martin Reservoir to the Colorado/Kansas border.

September 1998 Reg 32 RMH (32.28(6))

2018 -- Reviewed, no change (32.61(H)); 2013 -- changed from 642 µg/L to 190 µg/L (32.52(N)); 2007 -- changed from 290 to 642 (not mentioned in SBP?); 2002 -- no change (32.34(F)); 1998 -- original adoption 290 µg/L (32.28(6))

1c. Mainstem of the Arkansas River from the outlet of John Martin Reservoir to the Colorado/Kansas border.

2018 -- Reviewed, no change (32.61(H)); 2013 -- Reviewed, no change (32.52(G and N)); 2007 -- no change (not mentioned in SBP?); 2002 changed from 2400 to 1900 mg/L (32.34(F)); 1998 -- changed from 1400 to 2400 mg/L (32.28(6)); 1995 -- changed from 1800 to 1400 mg/L; original adoption in 1989 -- Segment 1 had sulfate = 1800 mg/L (32.15(D)

3b. Mainstem of West Torrino Canyon Creek, North Fork, Middle Fork and mainstem of Trujillo Creek, Mitotes Canyon Creek, Luis Canyon Creek, Wheeler Canyon Creek, Mauricio Canyon Creek, Daisy Canyon Creek, Adobe Canyon Creek, Gonzales Canyon Creek, Frio Canyon Creek, Borrego Canyon Creek, Munoz Canyon Creek, William Canyon Creek and Castro Canyon Creek, including all tributaries, from their sources to their confluences with the Apishapa River, except for the specific listings in Middle Arkansas segment 1.

2002 -- resegmented and applied ag and Water Supply standards to new Segment 3b; 0.5 was the old use-based Water Supply standard; there does not seem to be SBP describing this proposal, but Cedar Ridge's rebuttal addresses the intent of the proposed set of standards

4a. Mainstem of the Apishapa River from I-25 to the confluence with the Arkansas River. Mainstem of Timpas Creek from the source to the Arkansas River.

4b. Mainstem of Lorencito Canyon, from the source to the confluence with the Purgatoire River.

5a.Mainstem of the North Fork of the Purgatoire River, including all tributaries and wetlands, from the source to a point immediately below the confluence with Guajatoyah Creek; mainstem of the Middle Fork of the Purgatoire River, including all tributaries and wetlands, from the source to the Bar Ni Ranch Road at Stonewall Gap; Mainstem of the South Fork of the Purgatoire River, including all tributaries and wetlands, from the source to Tercio.

5b.Mainstem of the North Fork of the Purgatoire River, including all tributaries and wetlands, from a point immediately below the confluence with Guajatoyah Creek to the confluence with the Purgatoire River. Mainstem of the Middle Fork of the Purgatoire River from the Bar Ni Ranch Road at Stonewall Gap to the confluence with the North Fork of the Purgatoire River. Mainstem of the South Fork of the Purgatoire River from Tercio to the confluence with the Purgatoire River. Mainstem of the Purgatoire River to Trinidad Lake. Mainstem of Long Canyon Creek from the source to Trinidad Reservoir.

5c. Purgatoire mainstem from Trinidad Lake outlet works to I-25. Mainstem of Raton Creek from the source to the confluence of Purgatoire River.

6a.All tributaries to the Purgatoire River, including all wetlands, from the source to Interstate 25, except for specific listings in segments 4b, 5a, 5b, 5c and 6b.

6b.Wet Canyon and all tributaries, including wetlands, from the source to the confluence with the Purgatoire River.

2. Mainstem of the Arkansas River from the outlet of Pueblo Reservoir to a point immediately above the confluence with Wildhorse/Dry Creek Arroyo.

3. Mainstem of the Arkansas River from a point immediately above the confluence with Wildhorse/Dry Creek Arroyo to a point immediately above the confluence with Fountain Creek.

4a. Mainstem of Wildhorse Creek from the source to the confluence with the Arkansas River.

4g. Mainstem of Pesthouse Gulch, from the source to the confluence with Wildhorse Creek.

6b. Mainstem of the Saint Charles River from the confluence with Edson Arroyo to the confluence with the Arkansas River.

6b. Mainstem of the Saint Charles River from the confluence with Edson Arroyo to the confluence with the Arkansas River.

9. Mainstem of Greenhorn Creek, from a point immediately below the Greenhorn Highline (Hayden Supply Ditch) diversion dam, to the confluence with the Saint Charles River.

chlorophyll a (ug/L)

26. Horseshoe Lake, Martin Lake (Ohem Lake) and Walsenburg Lower Town Lake.

SSS vary by waterbody

2b. Mainstem of the Arkansas River from a point immediately above California Gulch to a point immediately above the confluence with Lake Fork.

2c. Mainstem of the Arkansas River from a point immediately above the confluence with the Lake Fork to a point immediately above the confluence with Lake Creek.

2c. Mainstem of the Arkansas River from a point immediately above the confluence with the Lake Fork to a point immediately above the confluence with Lake Creek.

4a. Mainstem of the Arkansas River from the Chaffee/Fremont County Line to a point immediately above Highway 115 bridge (38.390243, -105.068648), due east of Florence.

8a. Mainstem of Iowa Gulch from the source to the historic upper ASARCO water supply intake at 39.224327, -106.223432.

Tox studies; effluent wq and flow data; follow-up biological and wq sampling as needed

8a. Mainstem of Iowa Gulch from the source to the historic upper ASARCO water supply intake at 39.224327, -106.223432.

Tox studies; effluent wq and flow data; follow-up biological and wq sampling as needed

8b. Mainstem of Iowa Gulch from a point immediately below the historic upper ASARCO water supply intake at 39.224327, -106.223432 to a point immediately below the headgate of
the Paddock #1 Ditch (Iowa Ditch) at 39.215532, -106.286037.

Tox studies; effluent wq and flow data; follow-up biological and wq sampling as needed

8b. Mainstem of Iowa Gulch from a point immediately below the historic upper ASARCO water supply intake at 39.224327, -106.223432 to a point immediately below the headgate of
the Paddock #1 Ditch (Iowa Ditch) at 39.215532, -106.286037.

Tox studies; effluent wq and flow data; follow-up biological and wq sampling as needed

9. Mainstem of Iowa Gulch from a point immediately below the headgate of the Paddock #1 Ditch (Iowa Ditch) at 39.215532, -106.286037 to the confluence with the Arkansas River

Tox studies; effluent wq and flow data; follow-up biological and wq sampling as needed

9. Mainstem of Iowa Gulch from a point immediately below the headgate of the Paddock #1 Ditch (Iowa Ditch) at 39.215532, -106.286037 to the confluence with the Arkansas River

Tox studies; effluent wq and flow data; follow-up biological and wq sampling as needed

10. Mainstem of Lake Creek, including all tributaries and wetlands, from the source to the confluence with the Arkansas River, except for the specific listing in segment 11.

11. Mainstem of South Fork of Lake Creek, including all tributaries and wetlands, from the source to the confluence with Lake Creek.

11. Mainstem of South Fork of Lake Creek, including all tributaries and wetlands, from the source to the confluence with Lake Creek.

14c. Mainstems of North and South Hardscrabble Creeks, including all tributaries and wetlands, from their sources to their confluences.

20a. Mainstem of Fourmile Creek, including all tributaries and wetlands, from immediately below the confluence with High Creek to a point immediately above the confluence with Long Gulch, except for the specific listing to segment 23.

20b. Mainstem of Fourmile Creek, including all tributaries and wetlands, from the confluence with Long Gulch to the confluence with the Arkansas River.

20b. Mainstem of Fourmile Creek, including all tributaries and wetlands, from the confluence with Long Gulch to the confluence with the Arkansas River.

Mainstem of Fourmile Creek

22a. Mainstem of Arequa Gulch from the source to the confluence with Cripple Creek.

Sept 1988 Regs 32 and 42 RMH

22a. Mainstem of Arequa Gulch from the source to the confluence with Cripple Creek.

22a. Mainstem of Arequa Gulch from the source to the confluence with Cripple Creek.

22a. Mainstem of Arequa Gulch from the source to the confluence with Cripple Creek.

2a. Mainstem of the Blue River from above the confluence with French Gulch to a point one half mile below Coyne Valley Road (39.523189, -106.050805).

2a. Mainstem of the Blue River from above the confluence with French Gulch to a point one half mile below Coyne Valley Road (39.523189, -106.050805).

2b. Mainstem of the Blue River from a point one half mile below Coyne Valley Road (39.523189, -106.050805) to above the confluence with the Swan River.

2b. Mainstem of the Blue River from a point one half mile below Coyne Valley Road (39.523189, -106.050805) to above the confluence with the Swan River.

6b. Mainstem of Camp Creek, including all tributaries and wetlands, from the source to the confluence with the Snake River.

11. Mainstem of French Gulch from a point 1.5 miles below Lincoln (39.484661, -105.995074) to the confluence with the Blue River.

Existing Quality

Existing Quality

Commission directed division and parties to gather information to develop SSS in 2024

11. Mainstem of French Gulch from a point 1.5 miles below Lincoln (39.484661, -105.995074) to the confluence with the Blue River.

Existing Quality

Existing Quality

Commission directed division and parties to gather information to develop SSS in 2024

22. Dillon Reservoir and all lakes and reservoirs tributary to the Blue River above Dillon Reservoir, except for specific listings in Segment 21.

5a. Mainstem of the Eagle River from above the compressor house bridge at Belden (39.526879, -106.394950) to a point immediately above the Highway 24 Bridge near Tigiwon Road (39.554936, -106.401691).

5a. Mainstem of the Eagle River from above the compressor house bridge at Belden (39.526879, -106.394950) to a point immediately above the Highway 24 Bridge near Tigiwon Road (39.554936, -106.401691).

5a. Mainstem of the Eagle River from above the compressor house bridge at Belden (39.526879, -106.394950) to a point immediately above the Highway 24 Bridge near Tigiwon Road (39.554936, -106.401691).

5b. Mainstem of the Eagle River from a point immediately above the Highway 24 Bridge near Tigiwon Road (39.554936, -106.401691) to a point immediately above the confluence with Martin Creek.

5b. Mainstem of the Eagle River from a point immediately above the Highway 24 Bridge near Tigiwon Road (39.554936, -106.401691) to a point immediately above the confluence with Martin Creek.

5b. Mainstem of the Eagle River from a point immediately above the Highway 24 Bridge near Tigiwon Road (39.554936, -106.401691) to a point immediately above the confluence with Martin Creek.

5c. Mainstem of the Eagle River from a point immediately above Martin Creek to a point immediately above the confluence with Gore Creek.

5c. Mainstem of the Eagle River from a point immediately above Martin Creek to a point immediately above the confluence with Gore Creek.

5c. Mainstem of the Eagle River from a point immediately above Martin Creek to a point immediately above the confluence with Gore Creek.

7b. Mainstem of Cross Creek from below the Minturn Water Facility (39.565419, -106.417032) to the confluence with the Eagle River.

7b. Mainstem of Cross Creek from below the Minturn Water Facility (39.565419, -106.417032) to the confluence with the Eagle River.

7b. Mainstem of Cross Creek from below the Minturn Water Facility (39.565419, -106.417032) to the confluence with the Eagle River.

8. Mainstem of Gore Creek from the confluence with Black Gore Creek to the confluence with the Eagle River.

9a. Mainstem of the Eagle River from above Gore Creek to a point immediately below the confluence with Squaw Creek.

9b. Mainstem of the Eagle River from a point immediately below the confluence with Squaw Creek to a point immediately below the confluence with Rube Creek.

9. All lakes and reservoirs tributary to the North Platte and Encampment Rivers except for specific listings in Segment 8.

SSS vary by waterbody; TVS apply to some waterbodies

12. All lakes and reservoirs tributary to the Roaring Fork River, except for the specific listings in Segment 11.

SSS vary by waterbody; TVS apply to some waterbodies

8. Mainstem of the Williams Fork River, including all tributaries and wetlands, from the source to the confluence with the Colorado River, except for those tributaries in Segment 9.

12. Lakes and reservoirs within Arapahoe National Recreation Area, including Grand Lake, Shadow Mountain Lake and Lake Granby.

12. Lakes and reservoirs within Arapahoe National Recreation Area, including Grand Lake, Shadow Mountain Lake and Lake Granby.

SSS vary by waterbody; TVS apply in some locations

13. All lakes and reservoirs tributary to the Colorado River from the boundary of Rocky Mountain National Park and Arapahoe National Recreation Area to a point immediately above the confluence with the Roaring Fork River, except for specific listings in Upper Colorado Segments 11 and 12 and the Blue River and Eagle River subbasins.

SSS vary by waterbody; TVS apply in some locations

13b. Mainstem of Foidel Creek, including all tributaries and wetlands, from the source to the confluence with Middle Creek. Mainstem of Fish Creek, including all tributaries and wetlands, from County Road 27 (40.355559, -107.105131) to the confluence with Trout Creek, except for specific listings in Segment 13g. Mainstem of Middle Creek, including all tributaries and wetlands, from County Road 27 (40.339183, -107.025533) to the confluence with Trout Creek.

SSS apply to Middle Creek and Foidel Creek; TVS applies elsewhere

13d. Mainstem of Dry Creek, including all tributaries and wetlands, from the source to above the confluence with Temple Gulch.

13e. Mainstem of Sage Creek, including all tributaries and wetlands, from the source to the confluence with the Yampa River.

SSS apply to Sage Creek; TVS applies elsewhere

13g. All tributaries to Fish Creek from the confluence with Cow Camp Creek (40.398773, -107.016467) to the confluence with Trout Creek.

Bond Creek Mainstem
Cow Camp Creek Mainstem

22. All lakes and reservoirs tributary to the Yampa River from the source to the confluence with Elkhead Creek, except for those listed in Segment 21. All lakes and reservoirs tributary to Elkhead Creek from the source to the confluence with the Yampa River, except for specific listings in Segment 23. All lakes and reservoirs tributary to the Little Snake River, including those on National Forest lands.

SSS vary by waterbody; TVS apply in some locations

2008 (Steamboat & Stagecoach) revised 2014; Pearl Lake 2014

2. Mainstem of the Animas River, including all tributaries and wetlands, from the outlet of Denver Lake to a point immediately above the confluence with Minnie Gulch, except for specific listings in Segment 6.

3a. Mainstem of the Animas River, including wetlands, from a point immediately below the confluence with Minnie Gulch to immediately above the confluence with Cement Creek.

3a. Mainstem of the Animas River, including wetlands, from a point immediately below the confluence with Minnie Gulch to immediately above the confluence with Cement Creek.

3a. Mainstem of the Animas River, including wetlands, from a point immediately below the confluence with Minnie Gulch to immediately above the confluence with Cement Creek.

3a. Mainstem of the Animas River, including wetlands, from a point immediately below the confluence with Minnie Gulch to immediately above the confluence with Cement Creek.

3b. Mainstem of the Animas River, including wetlands, from a point immediately above the confluence with Cement Creek to a point immediately above the confluence with Mineral Creek.

4a. Mainstem of the Animas River, including wetlands, from a point immediately above the confluence with Mineral Creek to a point immediately above the confluence with Deer Park Creek.

4a. Mainstem of the Animas River, including wetlands, from a point immediately above the confluence with Mineral Creek to a point immediately above the confluence with Deer Park Creek.

4a. Mainstem of the Animas River, including wetlands, from a point immediately above the confluence with Mineral Creek to a point immediately above the confluence with Deer Park Creek.

4a. Mainstem of the Animas River, including wetlands, from a point immediately above the confluence with Mineral Creek to a point immediately above the confluence with Deer Park Creek.

7. Mainstem of Cement Creek, including all tributaries, and wetlands, from the source to the confluence with the Animas River.

8. Mainstem of Mineral Creek, including wetlands, from the source to a point immediately above the confluence with South Mineral Creek. All tributaries on the east side of this segment of Mineral Creek including wetlands, except for Big Horn Creek. Mainstem of the Middle Fork of Mineral Creek including all tributaries and wetlands from the source to the confluence with Mineral Creek except for Crystal Lake and its exiting tributary to confluence with Middle Fork of Mineral Creek.

9. Mainstem of Mineral Creek, including wetlands, from immediately above the confluence with South Mineral Creek to the confluence with the Animas River.