Raw Biological Data for the THORNTON RIVER at Route 628, 

Monumental Mills (C-18)

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 n/d n/d normal 71.6 120 2 0 0 0 0 0 15 52 0 0 45 0 8 72 7 0 0 0 0 0 201 10 Acceptable

Summer 01

30

8

normal

71.5

110

12

2

0

0

0

0

1

53

0

9

22

2

1

34

24

0

0

0

0

0

160

9

Acceptable

Fall 01

10

6

low

55

110

23

0

4

0

0

0

3

43

1

0

59

4

23

18

4

0

16

0

21

0

219

8

Acceptable

Winter 02

20 to 30

12

normal

33

110

13

0

0

0

0

0

21

34

0

1

38

7

5

67

6

0

7

2

7

0

208

7

Acceptable

Spring 02

30

6

normal

69

25

10

0

0

0

0

0

23

131

1

0

3

5

4

41

4

0

0

0

7

0

229

9

Acceptable

Summer 02

15

6 to 10

low

74

20

5

0

2

0 0 0

5

104

0

5

117

0

10

85

15

0 0 0

25

0

373

7

Acceptable

Fall 02

30

6

normal

51

200

0

0

0

0

0

0

1

41

0

2

19

16

1

5

0

0

0

7

0

0

92

7

Acceptable
Winter 03 27 15 normal 33 135 67 0 0 0 0 0 56 4 0 0 9 6 1 15 27 1 0 6 2 0 194 6 Unacceptable
Spring 03 40 n/d normal 58 50 25 0 0 0 0 0 11 114 1 0 17 7 8 68 4 1 3 0 0 0 259 9 Acceptable
Summer 03 30 18 normal 69 120 16 2 0 0 0 0 7 44 0 0 33 12 14 98 71 0 0 0 0 0 297 7 Acceptable
Return to C-18
n/d = No data