MBSS Site Summary for: PRWA-120-R-2002

Site Photos

Field photo showing stream conditions at site PRWA-120-R-2002-1 (Opens in a new window) Field photo showing stream conditions at site PRWA-120-R-2002-2 (Opens in a new window) Field photo showing stream conditions at site PRWA-120-R-2002-3 (Opens in a new window) Field photo showing stream conditions at site PRWA-120-R-2002-4 (Opens in a new window)

Located on POTOMAC R UT 2 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 - 2.0 / 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 531 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 7 %
Agricultural Land Use 21 %
Forested Land Use 72 %


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

Physical Stream Habitat
Instream Habitat 9/20 (Marginal)
Epifaunal Substrate 11/20 (Suboptimal)
Velocity/Depth Diversity 5/20 (Poor)
Pool Quality
Pool Extent = 46 meters 		7/20 (Marginal)
Riffle Quality
Riffle Extent = 29 meters 		6/20 (Marginal)
Shading 45 %
Embeddedness 35 %


Stream Water Quality:
Water temperature 23.6 ° C
Dissolved oxygen (DO) 6.6 mg/L
pH (lab) 7.29
Conductivity 170 µmho/cm
Alkalinity
(acid neutralizing capacity) 		539.4 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 2 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Blacknose Dace 118
Creek Chub 41
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
Northern Red Salamander
Northern Two-Lined Salamander

Crayfish:
No crayfish noted.

Exotic Plants:
Canada Thistle
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Amphinemura Spring Stonefly 34
Zavrelimyia Non-Biting Midges 6
Parametriocnemus Non-Biting Midges 5
Conchapelopia Non-Biting Midges 4
Eurylophella Mayfly 4
Nigronia Megaloptera (Dark Fishfly) 4
Nemouridae Nemourid Stonefly 4
Naididae Aquatic Worm 4
Prosimulium Black Fly 4
Tanytarsus Non-Biting Midges 4
Capniidae Small Winter Stonefly 3
Ephemerella Sulphur Mayfly 3
Pisidiidae Pill Clam 3
Lymnaeidae Pond Snail 1
Dytiscidae Predaceous Diving Beetle 1
Optioservus Riffle Beetle 1
Ferrissia Small Air-Breathing Freshwater Limpets 1
Neophylax Caddisfly 1
Gomphidae Clubtail Dragonfly 1
Ameletus Combmouthed Minnow Mayfly 1
Pseudolimnophila Crane Fly 1
Empididae Dance Fly 1
Dicranota Hairy-Eyed Cranefly 1
Caenis Mayfly 1
Procladius Non-Biting Midge 1
Chaetocladius Non-Biting Midges 1
Chironomus Non-Biting Midges 1
Eukiefferiella Non-Biting Midges 1
Microtendipes Non-Biting Midges 1
Phaenopsectra 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.