MBSS Site Summary for: PRWA-206-R-2002

Site Photos

Field photo showing stream conditions at site PRWA-206-R-2002-1 (Opens in a new window) Field photo showing stream conditions at site PRWA-206-R-2002-2 (Opens in a new window) Field photo showing stream conditions at site PRWA-206-R-2002-3 (Opens in a new window) Field photo showing stream conditions at site PRWA-206-R-2002-4 (Opens in a new window)

Located on GREEN SPRING RUN in the Potomac River WA Cnty watershed, 8-digit code: 02140501.
This stream was visited in the spring on 3/25/2002 and again in the summer on 7/10/2002.

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 - 2.8 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 1,658 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 14 %
Agricultural Land Use 6 %
Forested Land Use 79 %


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 14/20 (Suboptimal)
Velocity/Depth Diversity 12/20 (Suboptimal)
Pool Quality
Pool Extent = 21 meters 		11/20 (Suboptimal)
Riffle Quality
Riffle Extent = 54 meters 		16/20 (Optimal)
Shading 45 %
Embeddedness 35 %


Stream Water Quality:
Water temperature 13.9 ° C
Dissolved oxygen (DO) 10.7 mg/L
pH (lab) 8.11
Conductivity 390 µmho/cm
Alkalinity
(acid neutralizing capacity) 		2410 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 3 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Potomac Sculpin 184
Blacknose Dace 139
Fantail Darter 11
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Green Frog

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Gammarus Amphipod 53
Optioservus Riffle Beetle 27
Leuctridae Rolledwinged Stonefly 7
Parametriocnemus Non-Biting Midges 6
Antocha Crane Fly 3
Stempellinella Non-Biting Midges 2
Zavrelimyia Non-Biting Midges 1
Pisidiidae Pill Clam 1
Leptophlebia Pronggilled Mayfly 1
Baetidae Small Minnow Mayfly 1
Polycentropus Tube Maker Caddisfly 1
Hexatoma Crane Fly 1
Pycnopsyche Great Autumn Brown Sedge Caddisfly 1
Eurylophella Mayfly 1
Microtendipes Non-Biting Midges 1
Polypedilum Non-Biting Midges 1
Chelifera Aquatic Dance Fly 1
Probezzia Biting Midges 1
Sublettea 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.