Site Description

Site ID: NB03
Mendham Township, Morris County
Stream Category: FW2-NT (Category 2, Non-trout waters)
Site monitors North Branch Raritan River and Raritan River North Branch (incl. McVickers to India Brook) subwatershed (HUC: 02030105060030)
The site is located downstream of the historic schoolhouse at the intersection of Mosle and Union Schoolhouse Roads.
The sample site riffle is also adjacent to a wooded property preserved with a conservation easement held by Raritan Headwaters.

What is being monitored at this site?

  • Biological and Visual Assessments (?)
  • Chemical Testing (?)

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Water Quality Data

Each June, Raritan Headwaters scientists and volunteers visit 72 stream sites in the North and South Branch Raritan Watershed Region (WMA8) of New Jersey to collect data on the health of our streams.  Data collected includes a sample of benthic macroinvertebrates (used to calculate the High Gradient Macroinvertebrate Index;HGMI score), an assessment of the habitat in and around the stream, and chemical conditions in the water.  Chemical parameters include dissolved oxygen, phosphate, chloride, specific conductance, nitrate, turbidity, pH, and temperature. The HGMI is used by the NJ Department of Environmental Protection (NJDEP) and the US Environmental Protection Agency (USEPA) to determine if the site is meeting state and national water quality standards under the Clean Water Act. Click here to learn more about our stream monitoring program and water quality reports.


Site Data for NB03

Select a parameter below to view annual data. Hover over the chart to get more information.

Threats and Recommendations

The HGMI at NB03 was found to be good in 2019, which means it was not biologically impaired. The biggest water quality issue that we found at this site was instability of stream banks and width of riparian vegetated zone on the left bank. The water quality at this site seems to have improve from years past, and to continue this upward trend, it is important that we maintain healthy riparian buffers. Hosting or assisting with tree planting events along along riparian corridors can help to mitigate the main source of concern at this site.



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