Site 4 - Columbia Lock & Dam
Lat: 32.10.010 N
Long: 92.06.472 W
Site #4 - Columbia Lock and Dam is located just to the north of Columbia. The sample was taken on the upstream side of the lock.
Results
| Date | Time | pH | Dissolved Oxygen |
Ammonia | Nitrates/Nitrites | Sulfates |
| 3/13/05 | 11:05 AM | 6.9 | 8.1 ppm | 0.434 ppm | 0.229 ppm | 14 ppm |