MBSS Site Summary for: PRLN-626-S-2005
Located on Mill Run in the Potomac River L N Branch watershed,
8-digit code: 02141001.
This stream was visited in the spring on 4/26/2005 and again in the summer on 9/8/2005.
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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Fair - 3.5 / 5.0
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Benthic IBI
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Good - 4.5 / 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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484 acres
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An example of a forested stream.
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Urban Land Use
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0.5 %
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Agricultural Land Use
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2.5 %
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Forested Land Use
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64.6 %
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Stream Water Quality:
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| Water temperature |
15.9 ° C
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| Dissolved oxygen (DO) |
9.4 mg/L
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| Conductivity |
214 µmho/cm
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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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Blacknose Dace
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53 |
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Blue Ridge Sculpin
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24 |
Electrofishing to sample fish communities.
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| Japanese Stiltgrass |
| Multiflora Rose |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Baetis |
Blue-Winged Olive Mayfly
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23 |
| Leptophlebiidae |
Pronggilled Mayfly
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16 |
| Leuctridae |
Rolledwinged Stonefly
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14 |
| Micropsectra |
Non-Biting Midges
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12 |
| Heptageniidae |
Flathead Mayfly
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7 |
| Haploperla |
Green Stonefly
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6 |
| Diplectrona |
Net-Spinning Caddisfly
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6 |
| Parametriocnemus |
Non-Biting Midges
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4 |
| Leuctra |
Rolled-Winged Stonefly
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4 |
| Eukiefferiella |
Non-Biting Midges
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3 |
| Epeorus |
Mayfly
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3 |
| Orthocladiinae |
Midge
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3 |
| Ephemerellidae |
Spiny Crawler Mayfly
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2 |
| Amphinemura |
Spring Stonefly
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2 |
| Ephemerella |
Sulphur Mayfly
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2 |
| Pteronarcys |
Giant Stonefly
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2 |
| Neophylax |
Caddisfly
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2 |
| Perlidae |
Common Stonefly
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1 |
| Hexatoma |
Crane Fly
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1 |
| Philopotamidae |
Fingernet Caddisfly
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1 |
| Gammarus |
Amphipod
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1 |
| Prosimulium |
Black Fly
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1 |
| Paraleptophlebia |
Blue Quill Mayfly
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1 |
| Chloroperlidae |
Green Stonefly
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1 |
| Serratella |
Mayfly
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1 |
| Polypedilum |
Non-Biting Midges
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1 |
| Lumbriculidae |
Worm
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1 |
| Isoperla |
Stripetail Stonefly
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1 |
| Baetidae |
Small Minnow Mayfly
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1 |
| Oulimnius |
Riffle Beetle
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1 |
| Peltoperlidae |
Roachlike Stonefly
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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.
