MBSS Site Summary for: NANJ-331-S-2005
Located on Mill Run in the Nanjemoy Creek watershed,
8-digit code: 02140110.
This stream was visited in the spring on 4/11/2005 and again in the summer on 8/15/2005.
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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Good - 4.7 / 5.0
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Benthic IBI
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Good - 5.0 / 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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6,272 acres
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An example of a forested stream.
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Urban Land Use
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2.7 %
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Agricultural Land Use
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20.4 %
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Forested Land Use
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75.3 %
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Stream Water Quality:
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| Water temperature |
26.4 ° C
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| Dissolved oxygen (DO) |
4.2 mg/L
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Dissolved oxygen levels measured in the stream were very low (4.2 mg/L).
Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
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| pH (lab) |
6.55 |
| Conductivity |
76 µmho/cm
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Alkalinity
(acid neutralizing capacity)
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72.87027 µeq/L |
| Dissolved organic carbon (DOC) |
3.0988 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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| American Bullfrog |
| Northern Green Frog |
| Japanese Honeysuckle |
| Japanese Stiltgrass |
| Multiflora Rose |
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Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
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| Genus/Family |
Common Name |
Count |
| Cheumatopsyche |
Net-Spinning Caddisfly
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13 |
| Stenonema |
Flatheaded Mayfly
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8 |
| Eurylophella |
Mayfly
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8 |
| Rheosmittia |
Non-Biting Midges
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8 |
| Acerpenna |
Tiny Blue-Winged Olive Mayflies
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8 |
| Heptageniidae |
Flathead Mayfly
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7 |
| Ephemerella |
Sulphur Mayfly
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6 |
| Amphinemura |
Spring Stonefly
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4 |
| Tanypodinae |
Non-Biting Midges
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3 |
| Caecidotea |
Isopod
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3 |
| Triaenodes |
Long-Horned Caddisfly
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2 |
| Tubificidae |
Aquatic Worm
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2 |
| Tanytarsus |
Non-Biting Midges
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2 |
| Thienemannimyia group |
Non-Biting Midges
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2 |
| Pseudorthocladius |
Non-Biting Midges
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2 |
| Rheocricotopus |
Non-Biting Midges
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2 |
| Ancyronyx |
Spider Riffle Beetle
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2 |
| Dromogomphus |
Spinylegs Dragonfly
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2 |
| Hydroporus |
Water Beetle
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1 |
| Nigronia |
Megaloptera (Dark Fishfly)
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1 |
| Hydrobaenus |
Midge
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1 |
| Trissopelopia |
Non-Biting Midges
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1 |
| Ironoquia |
Northern Caddisfly
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1 |
| Macronychus |
Riffle Beetle
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1 |
| Stenelmis |
Beetle
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1 |
| Simulium |
Black Fly
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1 |
| Hydropsychidae |
Common Netspinner Caddisfly
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1 |
| Tipula |
Crane Fly
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1 |
| Calopteryx |
Damselfly
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1 |
| Heterotrissocladius |
European Non-Biting Midge
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1 |
| Prostoma |
Freshwater Nemertean (Ribbon Worm)
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1 |
| Ptilostomis |
Giant Casemaker Caddisfly
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1 |
| Pycnopsyche |
Great Autumn Brown Sedge Caddisfly
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1 |
| Chloroperlidae |
Green Stonefly
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1 |
| Paralauterborniella |
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1 |
| Hydropsyche |
Net-Spinning Caddisfly
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1 |
| Ablabesmyia |
Non-Biting Midge
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1 |
| Unniella |
Non-Biting Midge
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1 |
| Eukiefferiella |
Non-Biting Midges
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1 |
| Micropsectra |
Non-Biting Midges
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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.
