Creek Name: Rock Creek
Group
Name: Rock Creek Watershed Alliance/
Daniel Johnson Nature Preserve
Chemical
Data:
| Parameter/ Date |
Dissolved
Oxygen (ppm) |
pH |
Air |
Water |
Settleable
Solids (mg/L) |
Nitrate-Nitrogen (ppm) |
Ortho-phosphates (ppm) |
| 9/26/99 | 7.6 | 7.0 | 23 | 20 | n/a | n/a |
|
| 10/24/99 | 9.2 | 7.2 | 11 | 11 | n/a | 1.0 |
|
| 11/17/99 | 8.0 | 7.1 | 11 | 10 | 0 | 0 |
|
| 12/19/99 | 9.2 | 7.1 | 8.9 | 8.9 | n/a | 0 |
0
|
| 2/6/00 | 12.2 | 7.0 | 2.2 | 3.3 | n/a | n/a |
n/a
|
| 3/26/00 | 11.0 | 7.4 | 19.4 | 17.2 | 0 | 0 |
0
|
| 4/29/00 | 7.7 | 7.0 | 14.4 | 12.2 | n/a | 0 |
0
|
| 5/20/00 | 6.4 | 7.1 | 23.8 | 21.1 | n/a | 0 |
0
|
| 6/24/00 | 6.0 | 7.0 | 21.1 | 21.1 | n/a | 0 |
0
|
Biological
Data:
| Category/ Date |
Group
One (pollution sensitive) |
Group
Two (somewhat sensitive) |
Group
Three (pollution tolerant) |
Water
Quality Index Rating |
| 10/23/00 | crayfish, damselfly | aquatic
worm, leech, pouch snail |
7 poor |
|
| 4/11/00 | caddisfly | crane fly, atheux | aquatic
worm, leech |
9 poor |
| 6/3/00 | mayfly | crane fly | aquatic worm, black fly, pouch snail | 8 poor |