MBSS Site Summary for: PRLT-114-R-2004

Site Photos

Field photo showing stream conditions at site PRLT-114-R-2004-1 (Opens in a new window) Field photo showing stream conditions at site PRLT-114-R-2004-2 (Opens in a new window)

Located on MILL RUN in the Potomac River L tidal watershed, 8-digit code: 02140101.
This stream was visited in the spring on 3/11/2004 and again in the summer on 6/23/2004.

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 Fair - 3.3 / 5.0
Benthic IBI Good - 4.1 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 1,535 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 1 %
Agricultural Land Use 22 %
Forested Land Use 77 %


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 13/20 (Suboptimal)
Pool Quality
Pool Extent = 70 meters 		13/20 (Suboptimal)
Riffle Quality
Riffle Extent = 5 meters 		12/20 (Suboptimal)
Shading 80 %
Embeddedness 50 %


Stream Water Quality:
Water temperature 21.6 ° C
Dissolved oxygen (DO) 7.5 mg/L
pH (lab) 6.3
Conductivity 68 µmho/cm
Alkalinity
(acid neutralizing capacity) 		73.7 µeq/L
Dissolved organic carbon (DOC) 2.2 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 9 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Green Sunfish 94
Eastern Mudminnow 91
Golden Shiner 82
Creek Chubsucker 72
Pumpkinseed 51
Brown Bullhead 11
Bluegill 6
American Eel 3
Creek Chub 2
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Northern Green Frog
Southern Leopard Frog

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Honeysuckle
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Synurella Amphipod 43
Orthocladius Non-Biting Midges 16
Parametriocnemus Non-Biting Midges 15
Caecidotea Isopod 10
Hydrobaenus Midge 7
Crangonyx Amphipod 7
Clioperla Green-Winged Stonefly 6
Tanytarsus Non-Biting Midges 5
Acerpenna Tiny Blue-Winged Olive Mayflies 5
Hydroporus Water Beetle 5
Gammarus Amphipod 3
Leptophlebiidae Pronggilled Mayfly 2
Allocapnia Small Winter Stonefly 2
Gyrinus Whirlygig Beetle 2
Rheosmittia Non-Biting Midges 2
Xylotopus Midge 2
Nemouridae Nemourid Stonefly 2
Cheumatopsyche Net-Spinning Caddisfly 1
Dicrotendipes Non-Biting Midges 1
Micropsectra Non-Biting Midges 1
Nanocladius Non-Biting Midges 1
Tubificidae Aquatic Worm 1
Ceratopogon Biting Midge 1
Simuliidae Black Fly 1
Pseudolimnophila Crane Fly 1
Tipula Crane Fly 1
Calopteryx Damselfly 1
Paratendipes European Non-Biting Midge 1
Limnodrilus Worm 1
Eccoptura Yellow Stone Stonefly 1
Dineutus Whirlygig Beetle 1
Gordiidae Horsehair Worm 1
Leptophlebia Pronggilled Mayfly 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.