MBSS Site Summary for: PRUN-109-R-2001
Located on NORTH FORK OF SAND RUN in the Potomac River U N Branch watershed,
8-digit code: 02141005.
This stream was visited in the spring on 4/2/2001 and again in the summer on 8/6/2001.
Index of Biotic Integrity (IBI) Results:
An Index of Biotic Integrity (IBI) is a scientific tool used to identify and classify stream health. An IBI associates anthropogenic influences on a stream or with biological condition in the stream, and is formulated using data developed from biosurveys.
Details on the development and application of MBSS IBIs are in this document.
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Fish IBI
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Poor - 2.0 / 5.0
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Benthic IBI
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Poor - 2.0 / 5.0
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Land Use
Land use can provide important information for determining stream health.
(Hint: Screen readers will announce definitions; mouse users can hover over dotted text.)
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Catchment area
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431 acres
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An example of a highly channelized urban stream.
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Urban Land Use
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6 %
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Agricultural Land Use
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5 %
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Forested Land Use
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82 %
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Stream Water Quality:
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| Water temperature |
17.8 ° C
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| Dissolved oxygen (DO) |
8.3 mg/L
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| pH (lab) |
6.94 |
| Conductivity |
600 µmho/cm
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Alkalinity
(acid neutralizing capacity)
|
241.3 µeq/L |
| Dissolved organic carbon (DOC) |
1.2 mg/L |
Biological Stream Condition:
Surveys of the organisms living within a stream can give indications of stream health. Species richness, or the number of different species present, as well as indicator species (species whose presence, absence or abundance can serve as a measure of environmental conditions) are informative for stream health.
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The following 2 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Common name |
Count |
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Creek Chub
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81 |
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White Sucker
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14 |
Electrofishing to sample fish communities.
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Amphinemura |
Spring Stonefly
|
48 |
| Cheumatopsyche |
Net-Spinning Caddisfly
|
11 |
| Unniella |
Non-Biting Midge
|
9 |
| Hemerodromia |
Tiny Fly
|
8 |
| Hydropsyche |
Net-Spinning Caddisfly
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8 |
| Conchapelopia |
Non-Biting Midges
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5 |
| Pseudolimnophila |
Crane Fly
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5 |
| Chimarra |
Fingernet Caddisfly
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3 |
| Leuctra |
Rolled-Winged Stonefly
|
3 |
| Nemouridae |
Nemourid Stonefly
|
3 |
| Probezzia |
Biting Midges
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2 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
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1 |
| Lype |
Net Tube Caddisfly
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1 |
| Diplectrona |
Net-Spinning Caddisfly
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1 |
| Zavrelimyia |
Non-Biting Midges
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1 |
| Optioservus |
Riffle Beetle
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1 |
| Limnophyes |
Non-Biting Midge
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1 |
| Platycentropus |
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1 |
Sampling with a kick net.
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Information disclaimer: The information and data on this page is for guidance and general planning purposes only. It should not be used to make decisions on specific matters.
