MBSS Site Summary for: PRWA-124-R-2002

Site Photos

Field photo showing stream conditions at site PRWA-124-R-2002-1 (Opens in a new window) Field photo showing stream conditions at site PRWA-124-R-2002-2 (Opens in a new window)

Located on FROG HOLLOW in the Potomac River WA Cnty watershed, 8-digit code: 02140501.
This stream was visited in the spring on 3/6/2002 and again in the summer on 6/26/2002.

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 Poor - 1.0 / 5.0
Benthic IBI Fair - 3.5 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 494 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 3 %
Agricultural Land Use 4 %
Forested Land Use 93 %


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

Physical Stream Habitat
Instream Habitat 8/20 (Marginal)
Epifaunal Substrate 11/20 (Suboptimal)
Velocity/Depth Diversity 5/20 (Poor)
Pool Quality
Pool Extent = 45 meters 		6/20 (Marginal)
Riffle Quality
Riffle Extent = 20 meters 		6/20 (Marginal)
Shading 86 %
Embeddedness 35 %


Stream Water Quality:
Water temperature 20.1 ° C
Dissolved oxygen (DO) 6.2 mg/L
pH (lab) 7.3
Conductivity 170 µmho/cm
Alkalinity
(acid neutralizing capacity) 		473.6 µeq/L
Dissolved organic carbon (DOC) 2.6 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 1 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
No Fish Observed 0
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Two-Lined Salamander
Wood Frog

Crayfish:
Cambaridae

Exotic Plants:
Japanese Stiltgrass
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Ameletus Combmouthed Minnow Mayfly 36
Amphinemura Spring Stonefly 21
Prosimulium Black Fly 9
Leuctra  Rolled-Winged Stonefly 7
Oemopteryx Stonefly 7
Pseudorthocladius Non-Biting Midges 6
Hexatoma Crane Fly 4
Perlodidae Perlodid Stonefly 3
Oulimnius Riffle Beetle 3
Capniidae Small Winter Stonefly 2
Zavrelimyia Non-Biting Midges 2
Nemouridae Nemourid Stonefly 2
Psephenus Water Penny 2
Micropsectra Non-Biting Midges 2
Dicrotendipes Non-Biting Midges 1
Leptophlebiidae Pronggilled Mayfly 1
Heterotrissocladius European Non-Biting Midge 1
Chimarra Fingernet Caddisfly 1
Planariidae Flatworm 1
Clioperla Green-Winged Stonefly 1
Nigronia Megaloptera (Dark Fishfly) 1
Helichus Beetle 1
Culicoides 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.