MBSS Site Summary for: PG-N-201-330-97


Located on NORTHWEST BR ANACOSTIA R in the Anacostia River watershed, 8-digit code: 02140205.
This stream was visited in the spring on 3/18/1997 and again in the summer on 6/23/1997.

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 Good - 4.3 / 5.0
Benthic IBI Poor - 1.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 22,550 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 34.2 %
Agricultural Land Use 26.6 %
Forested Land Use 38.7 %


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

Physical Stream Habitat
Instream Habitat 16/20 (Optimal)
Epifaunal Substrate 16/20 (Optimal)
Velocity/Depth Diversity 14/20 (Suboptimal)
Pool Quality
Pool Extent = meters 		16/20 (Optimal)
Riffle Quality 15/20 (Suboptimal)
Shading 30 %
Embeddedness 35 %
Several measures of instream habitat were considered 'Optimal' at this location.


Stream Water Quality:
Water temperature 23 ° C
Dissolved oxygen (DO) 8.4 mg/L
pH (lab) 7.72
Conductivity 210 µmho/cm
Alkalinity
(acid neutralizing capacity) 		883.5 µeq/L
Dissolved organic carbon (DOC) 1.9 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 14 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 119
Spottail Shiner 103
Longnose Dace 100
Swallowtail Shiner 91
Tessellated Darter 48
Cutlip Minnow 36
Northern Hogsucker 22
Satinfin Shiner 22
Redbreast Sunfish 18
American Eel 13
White Sucker 6
Bluegill 3
Common Shiner 2
Rainbow Trout 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
No amphibians and reptiles noted.

Crayfish:
Orconectes limosus

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Naididae Aquatic Worm 66
Cricotopus/Orthocladius Midge 4
Tubificidae Aquatic Worm 3
Enchytraeidae Aquatic Worm 2
Hydropsyche Net-Spinning Caddisfly 2
Conchapelopia Non-Biting Midges 1
Cricotopus Non-Biting Midges 1
Eukiefferiella Non-Biting Midges 1
Polypedilum Non-Biting Midges 1
Limnodrilus Worm 1
Chelifera Aquatic Dance Fly 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.