MBSS Site Summary for: COCA-115-N-2003

Site Photos

Field photo showing stream conditions at site COCA-115-N-2003-1 (Opens in a new window) Field photo showing stream conditions at site COCA-115-N-2003-4 (Opens in a new window) Field photo showing stream conditions at site COCA-115-N-2003-2 (Opens in a new window) Field photo showing stream conditions at site COCA-115-N-2003-5 (Opens in a new window) Field photo showing stream conditions at site COCA-115-N-2003-3 (Opens in a new window)

Located on UT POTOMAC RIVER in the Potomac River WA Cnty watershed, 8-digit code: 02140501.
This stream was visited in the spring on 4/16/2003 and again in the summer on 7/29/2003.

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 - 1.0 / 5.0
Benthic IBI Poor - 1.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
(Hint: Screen readers will announce definitions; mouse users can hover over dotted text.)
Catchment area 1,103 acres Cows standing in a stream at a site with high agricultural land use. Cows survey the sampling procedure at this extreme example of a highly agriculturalized site.
Urban Land Use 5 %
Agricultural Land Use 81 %
Forested Land Use 13 %


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

Physical Stream Habitat
Instream Habitat 3/20 (Poor)
Epifaunal Substrate 6/20 (Marginal)
Velocity/Depth Diversity 6/20 (Marginal)
Pool Quality
Pool Extent = 40 meters 		2/20 (Poor)
Riffle Quality
Riffle Extent = 12 meters 		6/20 (Marginal)
Shading 97 %
Embeddedness 60 %
The embeddedness, a measure of silt on the stream bottom, was 60%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 14.1 ° C
Dissolved oxygen (DO) 8.6 mg/L
pH (lab) 8.13
Conductivity 675 µmho/cm
Alkalinity
(acid neutralizing capacity) 		5714 µeq/L
Dissolved organic carbon (DOC) 1.2 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 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:
No amphibians and reptiles noted.

Crayfish:
No crayfish noted.

Exotic Plants:
Japanese Stiltgrass
Multiflora Rose
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Diamesa Bloodworm 79
Diamesinae Non-Biting Midges 17
Tubificidae Aquatic Worm 12
Orthocladius Non-Biting Midges 3
Hydrobaenus Midge 2
Enchytraeidae Aquatic Worm 2
Tipulidae Cranefly 1
Diptera True 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.