Raw Biological Data for the THORNTON RIVER at Route 626,

Rock Mills (R-13)

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

Summer 01

20

12

normal

70.5

20

0

3

0

0

0

0

16

82

0

16

92

17

28

0

27

0

0

0

0

0

281

11

Fall 01

30

18

normal

50

20

0

2

0

0

0

0

29

47

0

1

176

14

76

14

2

1

0

0

0

0

362

9

Winter 02

15

6

low

34

40

22

2

0

0

0

0

17

102

0

3

70

47

87

51

20

1

0

0

1

0

423

11

Spring 02

25

18

normal

50

20

21

0

0

0

0

0

30

38

1

0

48

45

47

27

14

1

0

0

0

1

273

11

Summer 02

15

8

low

84

20

8

1

0

0

0

0

3

96

0

3

174

10

114

5

16

0

0

0

0

0

430

9

Fall 02

25 14

normal

51 20 7 5 0 0 0 0 10 57 0 3 162 36 166 2 3 2 0 2 0 0 455 8
Winter 03 25 10 normal 33 20 1 4 0 0 0 1 41 40 2 1 29 10 16 2 79 0 2 0 0 0 228 12
Spring 03 30 18 high 56 20 93 0 0 0 0 0 1 65 2 0 6 18 6 29 8 1 0 1 0 0 230 6
Winter 08 28 15 low 41 20 2 1 0 0 0 0 27 35 0 5 79 32 56 8 67 4 0 1 11 0 328 9
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