Site Description

Site ID: MC20
Union Township, Hunterdon County
Stream Category: FW2-TP(C1) (Trout production waters)
Site monitors Mulhockaway Creek subwatershed (HUC: 02030105020030)
The site is located downstream of the County Road 635 bridge, south of the intersection with Van Syckles Road. There is a pull off for fishing access just North of the site.

What is being monitored at this site?

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

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 MC20

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

Threats and Recommendations

The HGMI at MC20 was found to be excellent in 2019, which means it was not biologically impaired. MC20 has consistently scored good or excellent with respect to HGMI, meaning that this stream has very high water quality. Habitat and chemical parameters at this site also indicate a healthy stream. In systems like this, we must make an effort to preserve this high water quality and ecosystem health. Maintaining riparian buffers and improving green infrastructure can help to sustain and improve the health of this stream.



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