Raw Biological Data for the RAPPAHANNOCK RIVER at Route 621 (C-12)

Cycle

Avg. Width (ft)

Avg. Depth (in)

Flow Rate

Temp (°F)

Collection Time (sec)

Worms

Flatworms

Leeches

Crayfish

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

Ecological Condition

Spring 01

70

8

normal

61

40

1

0

4

0

0

0

93

122

0

1

24

7

14

3

1

0

0

0

0

6

276

11

Acceptable

Summer 01

40

3 to 4

low

75

30

0

0

0

0

0

0

3

20

0

0

29

125

11

5

5

1

0

0

2

0

201

11

Acceptable

Fall 01

45

7

normal

57

120

29

0

0

0

0

0

12

22

0

1

26

17

33

33

8

2

16

0

31

0

230

9

Acceptable

Winter 02

45

6 to 8

normal

39

20

1

1

0

0

0

0

184

27

0

1

63

30

22

22

5

2

1

0

3

0

362

11

Acceptable

Spring 02

45

8

normal

56.5

40

26

8

0

0

0

0

3

120

3

3

5

2

56

3

10

9

3

0

14

0

265

11

Acceptable

Summer 02

20

8

low

75.2

20

1

0

0

0

0

0

29

31

0

3

165

21

23

5

3

1

10

0

5

0

297

8

Acceptable

Fall 02

15

5

low

45

185

16

1

0

0

0

0

0

2

0

2

12

9

19

25

0

4

2

4

6

0

102

5

Unacceptable
Summer 03 water too high  
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