Looking Glass River Watershed Management Plan - Greater ...

Water Chemistry
From November 18 through November 25, 1994, a study was conducted to
assess the chronic toxicity of the Looking Glass River in DeWitt Township.
Ceriodaphnia dubia and fathead minnow tests were performed on samples
from the river and indicated the river water was not acutely or chronically
toxic to either species (Butler 1995). The river water met Michigan Water
Quality Standards and therefore the aquatic toxicity requirements. No toxic
chemicals were detected at or above the detection limit.
A water chemistry study was conducted in July of 1992 indicating that levels
of phosphorous and ammonia were slightly elevated but were only a result
of above average rainfall prior to sampling. The elevated levels were
subsequently of no concern (Scott 1993). See Table 3-7 for a summary of the
water chemistry data found during the study.
Table 3-7 Water Sampling Results July 8-10, 1992 (Scott 1993)
Parameter
Ellsworth Rd.
Clinton Co.
Gale Rd.
Shiawassee Co.
Woodbury Rd.
Shiawassee Co.
Chandler Rd.
Clinton Co.
Clark Rd.
Clinton Co.
COD (mg/l) 16 13 35 28 22
NO3+NO2 (mg N/l) 0.83 0.41 0.43 0.18 2.7
Ammonia (mg N/l) 0.07 0.06 0.13 0.15 0.12
Total Kjaldahl Nitrogen (mg N/l) 0.70 0.62 1.31 1.02 1.21
T. Phosphorous (mg P/l) 0.11 0.09 0.22 0.11 0.18
TOC (mg/l) 6.2 6.8 12 8.5 7.4
In addition to the collection of biological data in the 2002 MDEQ Looking
Glass River study, water chemistry data were collected. Water sample
results indicate that water quality standards were not exceeded (Roush
2003).
3-18 Looking Glass River Watershed April 2007