Water Quality Conditions in Lake Powell

and below Glen Canyon Dam 
10 

10 

10 

10 

10 

10 

elevation, Ft 

Lake Powell Temperature Dec 10-13 2019 

3600 

3550 

Deg C 3500 

Penstock 

3450 10

3400 

11 

3350 

9 

7 

3300 5 

3 

1 

3250 

3200 

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 

Km from GCD 

23 

21 

19 

17 

15 

13 

10 

10 

10 10 10 10 

Lake Powell Temperature Dec 2023 elevation, ft 

3550 

3500 

Deg C

10 

10 

10 

23 10 

10 

21 

10 

19 

17 

Lake Powell Temperature Dec 2022 elevation, ft 

3500 

Penstock 

Deg C 3450 

3400 

River Outlet 

15 

3350 13 

11 

9 

7 

3300 5 

3 

1 

3250 

3200 

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 

Km from Dam 

Penstock 

23 

3450 21 

19 

17 

3400 15 

13 

11 

3350 9 

7 

5 

3300 3 

1 

3250 

3200 

20 40 60 80 100 120 140 160 180 200 220 240 

Km from GCD 

10 10 

10 

10 

10 

elevation, ft Lake Powell Dec 2021 Temperature 

3500 

Penstock 

Deg C 3450 

23 

21 

3400 19 

17 River Outlet 

15 

3350 13 

11 

9 

3300 7 

5 

3 

1 

3250 

3200 

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 

Km from Dam 
20 

20 

20 

20 

20 

10 

10 

10 

10 

10 

10 

10 

elevation, ft 

3550 

3500 

Deg C 

Penstock 

3450 

21 

19 

17 

15 

13 

11 

3400 

3350 

9 

7 

5 

3 

1 

3300 

Lake Powell Forebay Temperature, March 2021 - Dec 2023 20

3250 

3200 

23 
12/16/2023 

Penstock 

1/13/2024 

Penstock 
8 

8 

8 

8 

4 

Lake Powell Dissolved Oxygen Dec 2023 elevation, ft 

3550 

3500 

Penstock m

1

1

1

1

9

8

7

6

5

4

3

2

1

0

14 

4 

11 4 

10 

8 

4 

4 

4 

Lake Powell December 2022 Dissolved Oxygen elevation, ft 

3500 

g/L 3450 

Penstock 

mg/L 

3.5 

13 2.5 

12 3400 1.5 

0.5 River Outlet .5 

.5 9 

.5 3350 8 

.5 7 

.5 6 

.5 5 

3300 .5 

.5 

.5 

.5 

3250 

3200 

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 

Km from Dam 

g/L

3.5

2.5

1.5

0.5

.5

.5 

.5

.5 

.5 

.5 

.5 

.5 

.5 

.5 

8 

8 

4 

8 

4 

4 

Lake Powell Dec 10 - 13 2019 Dissolved Oxygen 

3600 

3550 

3500 

Penstock 

3450 

3400 

6.5

3350 5.5

4.5 

3.5 

3300 

1.5 

0.5 

3250 

3200 

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250

13.5 

12.5 

11.5 

10.5 

9.5 

8.5 

7.5 

2.5 

4 

3 

2 

1 

3450 

3400 

3350 

3300 

3250 

3200 

20 40 60 80 100 120 140 160 180 200 220 240 

Km from GCD 

4 

4 

4 

4 

Lake Powell Dec 2021 Dissolved Oxygen 

8 200 

elevation, ft 

3500 

Penstock 

DO m 3450 

1

1

1 3400 

1

River Outlet 9

8

7 3350 

6

5

4

3300 3

2

1

0

3250 

3200 

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 210 220 230 

Km from Dam 
8 

8 

8 

4 

8 

8 

8 

8 

8 

8 

4 

4 

4 

4 

4 

8 

4 

4 

4 

4 

4 

4 

4 

Lake Powell Forebay, Dissolved Oxygen, March 21 - Dec 23 elevation, ft 

3550 

3500 mg/L 

Penstock 

14 

13 

3450 

12 

11 

10 

3400 9 

8 

7 

3350 6

5 

4 

3300 

3 

2 

1 

3250 

3200 
400 

300 

500 

500 

500 

500 

400 500 

500 

700 

700 

700 

700 

700 

elevation, ft 

3550 

3500 

Penstock mg/L

880 

840 

800 

760 

720 

680 

3450 

3400 

640 

600 

560 

520 

River Outlet 

3350 

480 

440 

400 

360 

320 

280 

240 

200 

3300 

Lake Powell Forebay TDS, March 2021 - Dec 2024 700

3250 

3200 



Questions?