MBSS Site Summary for: AL-A-626-216-96


Located on MILL RUN in the Potomac River L N Branch watershed, 8-digit code: 02141001.
This stream was visited in the spring on 4/11/1996 and again in the summer on 7/12/1996.

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 - 4.0 / 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 498 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 0 %
Agricultural Land Use 0 %
Forested Land Use 100.6 %


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

Physical Stream Habitat
Instream Habitat 15/20 (Suboptimal)
Epifaunal Substrate 10/20 (Marginal)
Velocity/Depth Diversity 14/20 (Suboptimal)
Pool Quality
Pool Extent = meters 		15/20 (Suboptimal)
Riffle Quality 12/20 (Suboptimal)
Shading 95 %
Embeddedness 0 %


Stream Water Quality:
Water temperature 15.2 ° C
Dissolved oxygen (DO) 8.5 mg/L
pH (lab) 7.51
Conductivity 139 µmho/cm
Alkalinity
(acid neutralizing capacity) 		629.4 µeq/L
Dissolved organic carbon (DOC) 1.1 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:
Fish data is unavailable or no fish observed.

Amphibians and Reptiles:
Northern Dusky Salamander
Northern Slimy Salamander
Northern Two-Lined Salamander
Northern Watersnake

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Amphinemura Spring Stonefly 33
Epeorus Mayfly 20
Diplectrona Net-Spinning Caddisfly 8
Isoperla Stripetail Stonefly 8
Eukiefferiella Non-Biting Midges 7
Paraleptophlebia Blue Quill Mayfly 6
Baetis Blue-Winged Olive Mayfly 6
Stenonema Flatheaded Mayfly 6
Ephemerella Sulphur Mayfly 5
Diamesa Bloodworm 4
Leuctra  Rolled-Winged Stonefly 3
Pteronarcys Giant Stonefly 3
Prosimulium Black Fly 2
Peltoperla 2
Orthocladiinae Midge 2
Nemouridae Nemourid Stonefly 2
Allocapnia Small Winter Stonefly 1
Simulium Black Fly 1
Hexatoma Crane Fly 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.