Centennial Brook and its watershed are located in Chittenden County, principally in the municipalities of Burlington and South Burlington.  The entire stream and its tributaries are Class B waters designated as cold water fish habitat pursuant to the Vermont Water Quality Standards. 

The stream is a small second order tributary to the Winooski River, with its confluence located about one half mile above the Winooski Dam. The total watershed size for the stream is 887 acres. The middle-lower portion of the watershed bounded by I-89, East Avenue and Grove Street contains the Centennial Woods Natural Area. This approximately 100-acre natural area is one of the University of Vermont’s natural areas that is managed under “preservation in perpetuity” conservation agreements. It is one of the few permanently protected areas in the City of Burlington and was created for the purpose of ecosystem protection and research. A network of trails and interpretive signs direct visitors through the area made up of mature conifer stands, mixed hardwoods, old field, streams and wetlands.  The land use breakdown within the watershed is 71% developed land, 4% open land and 25% forest. 

Centennial Brook is designated as impaired on the 2006 Vermont 303(d) List from its mouth at the Winooski River to a point upstream 1.2 miles 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 Centennial Brook watershed 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 one site on Centennial 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. 

 

Date Chloride (mg/L) Nitrogen, Total – Persulfate (mg/L) Phosphorus – Total (TP) (µg/L) Turbidity (NTU)
9/1/2015 551.5 --  88.6 22.8
8/18/15 500.75 -- 99.9 24.3
8/4/2015 565.5 --  101 29.6
7/21/2015 528.25 --  68.5 16.8
7/7/2015 481.5 --  65.7 12.2
6/23/2015 433.75 --  70.8 7
10/21/2014 368 --  57.6 10.9
8/19/2014 448 --  46.9 9.58
8/5/2014 406 --  49.7 8.52
7/22/2014 570 --  63.3 14.1
7/8/2014 584 --  59.4 7.14
6/24/2014 490 --  47.7 3.62
10/06/13  355.00  0.77  141.00  40.90 
9/10/2013 210 0.94 411 44.7
8/27/2013 295 0.61 64.4 7.31
8/13/2013 403 0.62 39.4 2.57
7/23/2013 468 2.34 83.1 9.38
7/9/2013 332 0.84 56.8 7.56
6/25/2013 290 0.67 84.4 16
9/11/2012 329 0.47 38.3 5.5
8/21/2012 320 0.48 44.5 4.13
8/7/2012 395 0.41 51.2 4.8
7/24/2012 177 0.61 108 31.6
7/10/2012 435 0.66 43.8 4.52
Average 2012 331.20 0.53 57.16 10.11
Average 2013 333 1.00 123.18 14.59
Average 2014 477.67 --  53.4 8.59
Average 2015 510.21 --  82.42 18.78

The Stream Team are also collecting data on Centennial Brook during storm events.  The following data indicate the water quality during two summer rain storms.

Date Chloride (mg/L) Nitrogen, Total – Persulfate (mg/L) Phosphorus – Digested (µg/L) TSS (mg/L) Turbidity (NTU)
8/11/15 582.25 -- 164 -- 58
8/12/12 148.00 0.46 83.30 14.60 --
8/28/12 339.00 0.27 44.40 2.40 --

The numbers in red indicate that the sample collected exceeds the standards set by the State of Vermont.

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 on the Agency of Natural Resources website

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