MBSS Site Summary for: PRLN-107-R-2003

Site Photos

Field photo showing stream conditions at site PRLN-107-R-2003-1 (Opens in a new window) Field photo showing stream conditions at site PRLN-107-R-2003-2 (Opens in a new window) Field photo showing stream conditions at site PRLN-107-R-2003-3 (Opens in a new window) Field photo showing stream conditions at site PRLN-107-R-2003-4 (Opens in a new window)

Located on SEVEN SPRINGS RUN UT2 UT1 in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 3/25/2003 and again in the summer on 6/26/2003.

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 - 1.7 / 5.0
Benthic IBI Fair - 3.8 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 399 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 1 %
Agricultural Land Use 1 %
Forested Land Use 98 %


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

Physical Stream Habitat
Instream Habitat 12/20 (Suboptimal)
Epifaunal Substrate 8/20 (Marginal)
Velocity/Depth Diversity 11/20 (Suboptimal)
Pool Quality
Pool Extent = 31 meters 		12/20 (Suboptimal)
Riffle Quality
Riffle Extent = 58 meters 		8/20 (Marginal)
Shading 93 %
Embeddedness 35 %


Stream Water Quality:
Water temperature 15.6 ° C
Dissolved oxygen (DO) 8.6 mg/L
pH (lab) 6.81
Conductivity 69 µmho/cm
Alkalinity
(acid neutralizing capacity) 		189.3 µeq/L
Dissolved organic carbon (DOC) 1.4 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 4 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 68
Creek Chub 47
Green Sunfish 4
Central Stoneroller 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Dusky Salamander
Northern Watersnake

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ephemerella Sulphur Mayfly 42
Amphinemura Spring Stonefly 21
Crangonyx Amphipod 9
Leuctridae Rolledwinged Stonefly 8
Perlodidae Perlodid Stonefly 8
Chloroperlidae Green Stonefly 5
Nemouridae Nemourid Stonefly 5
Prosimulium Black Fly 4
Lumbriculidae Worm 4
Heptageniidae Flathead Mayfly 3
Leptophlebiidae Pronggilled Mayfly 3
Rheocricotopus Non-Biting Midges 3
Eurylophella Mayfly 2
Parametriocnemus Non-Biting Midges 1
Hexatoma Crane Fly 1
Pseudolimnophila Crane Fly 1
Tipula Crane Fly 1
Heleniella European Non-Biting Midge 1
Tanytarsus Non-Biting Midges 1
Limnephilidae Northern Casemaker Caddisfly 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.