MBSS Site Summary for: NANJ-331-S-2001

Site Photos

Field photo showing stream conditions at site NANJ-331-S-2001-78 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2001-79 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2001-80 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2001-81 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2001-82 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2001-83 (Opens in a new window) Field photo showing stream conditions at site NANJ-331-S-2001-84 (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 3/12/2001 and again in the summer on 6/27/2001.

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.
Fish IBI Fair - 3.7 / 5.0
Benthic IBI Good - 4.7 / 5.0

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.)
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 15/20 (Suboptimal)
Epifaunal Substrate 10/20 (Marginal)
Velocity/Depth Diversity 13/20 (Suboptimal)
Pool Quality
Pool Extent = 48 meters 		15/20 (Suboptimal)
Riffle Quality
Riffle Extent = 29 meters 		8/20 (Marginal)
Shading 95 %
Embeddedness 40 %


Stream Water Quality:
Water temperature 19.8 ° C
Dissolved oxygen (DO) 7.2 mg/L
pH (lab) 6.66
Conductivity 60 µmho/cm
Alkalinity
(acid neutralizing capacity) 		89.4 µeq/L
Dissolved organic carbon (DOC) 1.6 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 13 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 14
Tessellated Darter 13
Creek Chubsucker 7
Pumpkinseed 5
Blacknose Dace 4
Creek Chub 4
White Sucker 4
Bluegill 3
Brown Bullhead 2
Redbreast Sunfish 2
Rosyside Dace 2
Chain Pickerel 1
Eastern Mosquitofish 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Eastern American Toad
Northern Green Frog
Pickerel Frog

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
Oulimnius Riffle Beetle 16
Ephemerella Sulphur Mayfly 13
Acerpenna Tiny Blue-Winged Olive Mayflies 11
Rheosmittia Non-Biting Midges 8
Prosimulium Black Fly 5
Nemouridae Nemourid Stonefly 4
Isoperla Stripetail Stonefly 4
Optioservus Riffle Beetle 4
Orthocladiinae Midge 3
Eukiefferiella Non-Biting Midges 3
Cheumatopsyche Net-Spinning Caddisfly 2
Hexatoma Crane Fly 2
Neophylax Caddisfly 2
Heptageniidae Flathead Mayfly 2
Chloroperlidae Green Stonefly 2
Eccoptura Yellow Stone Stonefly 2
Tribelos Non-Biting Midges 1
Tvetenia Non-Biting Midges 1
Perlodidae Perlodid Stonefly 1
Caecidotea Isopod 1
Cricotopus/Orthocladius Midge 1
Perlidae Common Stonefly 1
Leuctra  Rolled-Winged Stonefly 1
Stenelmis Beetle 1
Tipula Crane Fly 1
Chironomini Non-Biting Midge 1
Orthocladiinae A Non-Biting Midges 1
Polypedilum Non-Biting Midges 1
Potthastia Non-Biting Midges 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.