Survey Report

Blacktail Dam
Williams County

June 2026

2025 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

90.1

158.0

1.6-7.5

4.5

0.0-0.3

0.1

Yellow Perch

9.6

16.8

3.1-7.9

5.1

0.0-0.2

0.1

Northern Pike

0.2

0.4

3.5-3.9

3.7

Smallmouth Bass

0.1

0.2

14.2-14.2

14.2

1.4-1.4

1.4

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Northern Pike

32.0

5.3

21.3-35.4

26.7

2.1-10.4

4.6

Walleye

28.0

4.7

11.0-27.6

20.0

0.4-6.7

3.1

Yellow Perch

22.0

3.7

5.5-7.9

6.0

0.1-0.2

0.1

White Sucker

16.0

2.7

11.0-20.9

15.3

0.6-4.1

1.9

Black Crappie

2.0

0.3

6.3-6.3

6.3

0.1-0.1

0.1

2024 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Yellow Perch

54.5

96.0

3.1-8.3

5.3

0.0-0.2

0.1

Bluegill

45.1

79.4

2.0-9.4

5.3

0.0-0.7

0.2

Northern Pike

0.2

0.4

21.3-35.4

28.3

2.1-8.1

5.1

Smallmouth Bass

0.1

0.2

13.4-13.4

13.4

1.2-1.2

1.2

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Yellow Perch

72.1

31.0

5.1-8.7

6.9

0.1-0.3

0.1

Northern Pike

10.1

4.3

15.7-33.1

23.4

0.8-7.7

3.1

Walleye

9.3

4.0

10.2-23.6

16.5

0.3-4.7

2.0

White Sucker

8.5

3.7

8.3-18.1

15.5

0.3-3.2

1.9

2023 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

57.1

55.8

2.4-9.1

4.6

0.0-0.6

0.1

Yellow Perch

41.9

41.0

3.1-8.3

5.7

0.0-0.3

0.1

Northern Pike

0.4

7.5-34.6

21.1

0.1-9.5

4.8

Black Crappie

0.2

4.3-4.3

4.3

0.0-0.0

0.0

Smallmouth Bass

0.2

7.9-7.9

7.9

0.3-0.3

0.3

White Sucker

0.2

10.6-10.6

10.6

0.5-0.5

0.5

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Yellow Perch

72.4

31.5

5.1-7.5

6.1

0.1-0.2

0.1

Northern Pike

12.6

5.5

23.2-33.1

27.3

2.9-7.9

4.6

Walleye

8.0

3.5

11.4-23.2

17.5

0.5-4.0

2.1

White Sucker

5.7

2.5

15.4-21.7

18.3

1.6-4.1

2.8

Bluegill

1.1

0.5

9.1-9.1

9.1

0.6-0.6

0.6

2022 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

94.2

42.2

2.0-7.9

3.3

0.0-0.4

0.1

Yellow Perch

5.4

2.4

5.1-6.7

6.0

0.1-0.1

0.1

Smallmouth Bass

0.4

0.2

13.8-13.8

13.8

1.5-1.5

1.5

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Walleye

41.1

7.7

9.8-29.1

17.2

0.3-7.8

2.3

Yellow Perch

25.0

4.7

5.5-7.1

6.0

0.1-0.1

0.1

Northern Pike

17.9

3.3

23.2-35.0

29.1

2.8-8.9

5.4

White Sucker

12.5

2.3

9.1-16.1

13.6

0.3-1.9

1.2

Smallmouth Bass

3.6

0.7

18.5-18.5

18.5

3.9-4.1

4.0

2021 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

64.3

6.0

1.6-7.9

6.2

0.2-0.4

0.3

White Sucker

17.9

1.7

11.0-22.8

18.3

0.5-6.1

3.2

Yellow Perch

14.3

1.3

4.7-7.9

5.9

0.0-0.2

0.1

Smallmouth Bass

3.6

0.3

11.8-15.7

13.8

0.9-2.3

1.6

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Yellow Perch

36.8

10.7

5.1-6.7

5.7

0.1-0.1

0.1

White Sucker

29.9

8.7

11.0-22.0

17.8

0.6-5.8

2.9

Northern Pike

24.1

7.0

16.1-30.7

24.5

1.0-6.8

3.6

Walleye

9.2

2.7

10.2-20.5

15.8

0.3-3.5

1.6

2020 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

76.0

6.3

2.8-8.7

6.3

0.0-0.6

0.2

Yellow Perch

24.0

2.0

3.1-4.7

3.9

0.0-0.0

0.0

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Yellow Perch

54.8

22.7

5.1-7.9

6.3

0.1-0.2

0.1

Walleye

18.5

7.7

11.0-26.8

17.4

0.4-6.8

2.2

Northern Pike

16.1

6.7

16.1-38.6

24.8

0.9-14.1

3.9

White Sucker

8.1

3.3

16.5-21.3

19.6

2.1-4.8

3.7

Bluegill

1.6

0.7

6.7-7.5

7.1

0.2-0.4

0.3

Smallmouth Bass

0.8

0.3

17.3-17.3

17.3

2.8-2.8

2.8

2019 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

94.5

20.2

1.6-7.9

4.1

0.0-0.5

0.1

Yellow Perch

5.5

1.2

2.4-4.7

3.2

0.0-0.0

0.0

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Walleye

33.7

10.3

7.1-26.0

19.3

0.1-6.5

3.0

Yellow Perch

31.5

9.7

5.1-7.9

5.9

0.1-0.2

0.1

Northern Pike

20.7

6.3

14.6-39.4

25.9

0.6-13.5

4.3

White Sucker

12.0

3.7

9.4-21.3

18.7

0.4-5.1

3.6

Smallmouth Bass

2.2

0.7

11.4-13.4

12.4

0.8-1.3

1.0

2018 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

81.8

114.7

2.0-8.7

4.4

0.0-0.7

0.1

Yellow Perch

18.1

25.3

3.5-8.3

5.3

0.0-0.2

0.1

White Sucker

0.1

0.2

20.9-20.9

20.9

4.1-4.1

4.1

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Yellow Perch

48.1

16.7

5.1-8.3

5.9

0.1-0.2

0.1

Walleye

31.7

11.0

10.2-26.4

18.1

0.3-5.9

2.4

White Sucker

10.6

3.7

12.6-23.2

18.9

1.0-5.2

3.3

Northern Pike

8.7

3.0

20.9-30.7

26.9

1.9-6.5

4.3

Bluegill

1.0

0.3

9.4-9.4

9.4

0.9-0.9

0.9

2017 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

94.3

227.8

2.0-10.2

3.2

0.0-0.9

0.0

Yellow Perch

5.5

13.3

3.1-8.7

5.4

0.0-0.3

0.1

Smallmouth Bass

0.1

0.3

7.5-8.3

7.9

0.2-0.2

0.2

Northern Pike

0.1

0.2

25.2-25.2

25.2

3.6-3.6

3.6

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Walleye

39.4

9.3

8.3-24.4

16.8

0.1-5.4

1.8

Northern Pike

25.4

6.0

16.1-36.6

22.5

0.9-11.1

2.9

Yellow Perch

15.5

3.7

5.1-10.2

6.8

0.1-0.4

0.1

White Sucker

12.7

3.0

17.3-21.3

19.0

2.3-4.6

3.2

Smallmouth Bass

4.2

1.0

12.2-17.3

15.5

1.0-2.5

2.0

Bluegill

2.8

0.7

9.1-9.8

9.4

0.7-0.8

0.8

2016 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Bluegill

66.3

116.2

2.8-9.4

4.0

0.0-0.9

0.1

Yellow Perch

33.5

58.7

2.8-8.7

5.6

0.0-0.3

0.1

Northern Pike

0.1

0.2

22.8-22.8

22.8

2.5-2.5

2.5

Smallmouth Bass

0.1

0.2

9.4-9.4

9.4

0.4-0.4

0.4

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 80'

Catch

Net

Range

Average

Range

Average

Northern Pike

25.3

7.3

16.1-35.0

23.8

0.9-10.4

3.4

Yellow Perch

25.3

7.3

5.5-7.5

6.6

0.1-0.2

0.1

White Sucker

20.7

6.0

14.6-22.0

17.9

1.6-4.6

2.7

Walleye

19.5

5.7

7.9-24.8

17.1

0.2-5.5

2.2

Smallmouth Bass

5.7

1.7

13.4-18.5

15.0

1.3-3.9

2.0

Bluegill

3.4

1.0

7.9-9.4

8.5

0.4-0.8

0.6

2015 Survey Year

Fish Per

Length (Inches)

Weight (Pounds)

3 X 4 Trap Net

Catch

Net

Range

Average

Range

Average

Yellow Perch

54.2

16.0

1.2-6.3

3.1

0.0-0.1

0.0

Bluegill

45.8

13.5

1.2-7.5

4.4

0.0-0.5

0.3

Fish Per

Length (Inches)

Weight (Pounds)

Variegated Mesh 6' x 125'

Catch

Net

Range

Average

Range

Average

Northern Pike

35.6

10.5

13.4-29.5

21.4

0.5-5.9

2.5

White Sucker

22.0

6.5

12.8-17.7

15.5

0.9-2.9

1.8

Walleye

20.3

6.0

11.0-21.3

16.7

0.4-3.7

1.8

Yellow Perch

16.9

5.0

5.9-7.9

7.1

0.1-0.2

0.2

Bluegill

5.1

1.5

8.3-8.7

8.4

0.5-0.7

0.6

Blacktail DamWilliams County

Blacktail Dam
Williams County