The stormwater impaired portion of the Indian Brook watershed is located in Chittenden County in the Town of Essex and in the Village of Essex Junction. The headwaters in Essex originate in the undeveloped vicinity of the Indian Brook Reservoir from which the stream flows southward beneath the major roads of Rts. 289 and 15 as it enters the more developed areas of Essex Junction and then ultimately flows to Lake Champlain via the large wetland complex associated with Mallets Creek and Mallets Bay.

The entire stream portion and its tributaries within the impaired reach are Class B waters designated as cold water fish habitat pursuant to the Vermont Water Quality Standards. The total watershed area of the impaired section is approximately 4,580 acres. The land use breakdown of the watershed draining to the impaired reach is 39% developed lands, 18% agricultural or open lands and 43% forested or wetlands.

Indian Brook is designated as impaired on the 2006 Vermont 303(d) List due to non-support of aquatic life designated uses. Since all tributaries and the upstream main stem drain to the impaired lower portion of the stream, the entire Indian Brook watershed upstream from river mile 5.8 is considered to contribute to its impairment. The source of the impairment is multiple impacts associated with excess stormwater runoff.

 

Currently, the Stream Team is monitoring two sites along Indian Brook with the help of volunteers. Water samples are being taken twice monthly throughout the summer and are tested for phosphorous, nitrogen, chloride, and turbidity.

Location Date Chloride (mg/L) Nitrogen, Total – Persulfate (mg/L) Phosphorus – Total (TP) (µg/L) Turbidity (NTU)
Indian 10 9/1/2015 286.2 -- 42.6 8.6
Indian 20 9/1/2015 183.6 -- 32.8 7.11
Indian 10 8/18/15 243 -- 40.6  7.28
Indian 20 8/18/15  99.82  -- 41.7  7.8
Indian 10 8/4/2015 202 -- 38.1 6.8
Indian 20 8/4/2015 64.46 -- 52.5 19.5
Indian 10 7/21/2015 123.8 -- 39.6 7.45
Indian 20 7/21/2015 29.46 -- 62.7 15.2
Indian 10 7/7/2015 55.1 -- 32.7 7.35
Indian 20 7/7/2015 11.72 -- 26.9 4.55
Indian 10 6/23/2015 45.74 -- 78.5 20.3
Indian 20 6/23/2015 13.39 -- 51.4 17.7
Indian 10 10/21/2014 122 -- 32.1 2.63
Indian 10 8/19/2014 116 -- 30.2 4.62
Indian 20 8/19/2014 28.6 -- 30.7 5.4
Indian 10 8/5/2014 126 -- 42.2 15.7
Indian 20 8/5/2014 31.7 -- 39.7 12.8
Indian 10 7/22/2014 238 -- 33.8 7.57
Indian 20 7/22/2014 132 -- 44.9 9.72
Indian 10 7/8/2014 165 -- 36.1 4.88
Indian 20 7/8/2014 44.2 -- 42.5 10.9
Indian 10 6/24/2014 224 -- 37.4 7.4
Indian 20 6/24/2014 87.9 -- 53.6 19.6
Indian 10 10/6/2013 161 1.33  54.60  5.52
Indian 10 9/10/2013 85 1.07 71.7 7.86
Indian 10 8/27/2013 163 1.34 53.4 16.6
Indian 20 8/27/2013 99.4 0.4 35.6 6.42
Indian 10 8/13/2013 179 1.61 40.5 5.04
Indian 20 8/13/2013 77.6 0.43 59 4.64
Indian 10 8/7/2013 150 1.25 31.3 4.05
Indian 20 8/7/2013 43.7 0.36 37.2 9.06
Indian 10 7/9/2013 52.9 0.78 36.5 5.65
Indian 20 7/9/2013 9.51 0.37 37.8 5.05
Indian 10 6/24/2013 39.6 0.65 52.3 7.71
Indian 20 6/24/2013 9.65 0.35 39.9 4
Indian 10 9/11/2012 110 0.93 33.3 5.46
Indian 20 9/11/2012 34.4 0.41 32.5 4.9
Indian 10 8/21/2012 219 1.35 45.2 8.74
Indian 20 8/21/2012 161 0.49 49.9 10.3
Indian 10 8/7/2012 258 1.21 65.1 11.5
Indian 20 8/7/2012 211 0.53 57.8 8.82
Indian 10 7/24/2012 50.3 0.79 115 35.6
Indian 20 7/24/2012 21.7 0.71 92.2 15.1
Indian 10 7/10/2012 176 1.23 47.5 10.7
Indian 20 7/10/2012 73.9 0.53 48.6 11.4
Average 2012 131.53 0.82 58.71 12.25
Average 2013 89.20 0.83 45.02 6.92
Average 2014 119.58 --  38.47 9.20
Average 2015 113.19 --  45.01 10.80

 

We are also monitoring Indian Brook during storm events. The data from summer rain storms are listed below.

Location Date Chloride (mg/L) Nitrogen, Total – Persulfate (mg/L) Phosphorus – Digested(µg/L) TSS (mg/L) Turbidity(NTU)
Indian 10 8/11/15 172.32 -- 63.5 -- 8.54
Indian 10 8/12/12 66.80 0.82 91.00 32.40 --
Indian 10 8/28/12 211.00 1.30 48.30 3.20 --

All of the data collected by Chittenden County Stream Team volunteers is shared with the State of Vermont Department of Environmental Conservation (VT DEC). The DEC shares all state-wide data with the Environmental Protection Agency.

State-wide Vermont water quality data can be found here: https://anrweb.vermont.gov/dec/dec/VolunteerMonitoriing.aspx

National water quality data can be found here: http://www.epa.gov/storet/