MBSS Site Summary for: NANJ-331-S-2003

Site Photos

Field photo showing stream conditions at site NANJ-331-S-2003-704 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2003-705 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2003-706 (Opens in a new window)

Located on MILL RUN in the Nanjemoy Creek watershed, 8-digit code: 02140110.
This stream was visited in the spring on 3/17/2003 and again in the summer on 6/24/2003.

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.
Fish IBI Poor - 2.3 / 5.0
Benthic IBI Fair - 3.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 6,272 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 2.7 %
Agricultural Land Use 20.4 %
Forested Land Use 75.3 %


Stream showing woody debris, logs, and rocky substrate.
An example of woody debris in a stream.

Physical Stream Habitat
Instream Habitat 13/20 (Suboptimal)
Epifaunal Substrate 14/20 (Suboptimal)
Velocity/Depth Diversity 14/20 (Suboptimal)
Pool Quality
Pool Extent = 35 meters 		15/20 (Suboptimal)
Riffle Quality
Riffle Extent = 45 meters 		12/20 (Suboptimal)
Shading 92 %
Embeddedness 40 %


Stream Water Quality:
Water temperature 19.2 ° C
Dissolved oxygen (DO) 8.6 mg/L
pH (lab) 6.14
Conductivity 68 µmho/cm
Alkalinity
(acid neutralizing capacity) 		44.7 µeq/L
Dissolved organic carbon (DOC) 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. 		Close-up of a mayfly indicator species.

Fish Survey Results:
The following 9 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 9
White Sucker 7
Spottail Shiner 5
Bluegill 3
Brown Bullhead 3
Yellow Bullhead 2
Chain Pickerel 1
Golden Shiner 1
Satinfin Shiner 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Eastern Cricket Frog
Eastern Ratsnake
Northern Green Frog
Northern Spring Peeper

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Honeysuckle
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Prostoia Spring Stonefly 50
Nemouridae Nemourid Stonefly 33
Prosimulium Black Fly 12
Oulimnius Riffle Beetle 7
Perlodidae Perlodid Stonefly 6
Capniidae Small Winter Stonefly 3
Strophopteryx Early Brown Stonefly 3
Neophylax Caddisfly 2
Ameletus Combmouthed Minnow Mayfly 1
Eukiefferiella Non-Biting Midges 1
Thienemannimyia group Non-Biting Midges 1
Amphinemura Spring Stonefly 1
Optioservus Riffle Beetle 1
Gordiidae Horsehair Worm 1
Caecidotea Isopod 1
Orthocladiinae Midge 1
Stegopterna Black Fly 1
Synurella Amphipod 1
Tubificidae Aquatic Worm 1
Oemopteryx Stonefly 1
Kick net sampling for macroinvertebrates.
Sampling with a kick net.

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.