Raw Biological Data for the North Fork of the THORNTON RIVER 

at Route 612 (R-6)

Cycle

Avg. Width (ft)

Avg. Depth (in)

Flow Rate

Temp (°F)

Collection Time (sec)

Worms

Flatworms

Leeches

Crayfishes

Sowbugs

Scuds

Stoneflies

Mayflies

Dragonflies Damselflies

Hellgrammites Fishflies Alderflies

Net-spinning Caddisflies

Most Caddisflies

Beetles

Midges

Black Flies

Most True Flies

Gilled Snails

Lunged Snails

Clams

Other

Total

Index Value

Spring 01

15

8

normal

63

25

17

1

0

1

0

0

55

75

0

0

48

38

7

0

0

1

0

0

0

0

243

8

Summer 01

7

12

low

67

35

4

17

0

0

0

0

20

48

1

3

66

38

28

28

11

2

0

0

0

1

267

10

Fall 01

10

6

low

46.5

90

12

0

0

0

0

0

37

27

0

2

23

19

93

0

0

0

0

0

0

0

213

11

Winter 02

15

8

low

36

20

3

0

0

0

0

0

20

22

0

4

26

28

107

15

0

0

0

0

0

0

225

11

Spring 02

25

10

high

57

20

6

0

0

0

0

0

63

18

0

3

73

59

51

33

0

4

0

0

0

0

310

11

Summer 02

20

5

low

75

30

13

0

0

1

0

0

27

21

0

1

38

39

48

9

1

8

0

0

0

0

206

11

Fall 02

20

8 to 10

normal

n/d

20

11

0

0

1

0

0

33

13

0

6

44

71

129

15

1

1

0

2

0

0

327

11

Spring 03 25 8 to 10 high 58 20 4 0 0 0 0 0 94 68 1 7 26 38 65 28 0 9 0 0 0 0 340 12
Summer 03 20 6 normal 62 30 31 0 0 0 0 0 24 11 3 5 68 21 53 42 1 9 0 0 0 0 268 9
Spring 04 20 8 high 54 30 7 0 0 0 1 0 128 46 1 2 37 33 18 7 0 9 0 0 0 0 245 10
Summer 04 10 6 low n/d 30 38 0 0 0 0 0 45 16 1 11 49 42 23 16 0 4 0 0 0 0 255 12
Fall 04 20 8 normal 50 60 0 0 0 0 0 0 38 73 0 1 21 52 17 49 2 2 0 0 0 0 363 10
Fall 06 20 8 normal 58 54 14 0 0 2 0 0 39 43 0 2 41 52 78 54 0 8 0 0 0 0 333 12
Return to R-6     n/d = No data