MBSS Site Summary for: EVIT-109-R-2004


Located on WILLOW BROOK in the Evitts Creek watershed, 8-digit code: 02141002.
This stream was visited in the spring on 3/4/2004 and again in the summer on 7/21/2004.

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 Poor - 1.5 / 5.0
Benthic IBI Poor - 2.0 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 612 acres A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 49 %
Agricultural Land Use 8 %
Forested Land Use 43 %


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

Physical Stream Habitat
Instream Habitat 11/20 (Suboptimal)
Epifaunal Substrate 6/20 (Marginal)
Velocity/Depth Diversity 12/20 (Suboptimal)
Pool Quality
Pool Extent = 41 meters 		14/20 (Suboptimal)
Riffle Quality
Riffle Extent = 39 meters 		7/20 (Marginal)
Shading 77 %
Embeddedness 30 %


Stream Water Quality:
Water temperature 18.9 ° C
Dissolved oxygen (DO) 6.9 mg/L
pH (lab) 8.32
Conductivity 967 µmho/cm
Alkalinity
(acid neutralizing capacity) 		1012 µeq/L
Dissolved organic carbon (DOC) 1.4 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 7 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Creek Chub 198
Blacknose Dace 66
White Sucker 8
Green Sunfish 7
Potomac Sculpin 6
Fantail Darter 5
Central Stoneroller 2
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
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
Orthocladius Non-Biting Midges 32
Sympotthastia Non-Biting Midges 18
Thienemannimyia group Non-Biting Midges 16
Tvetenia Non-Biting Midges 7
Stenelmis Beetle 5
Chimarra Fingernet Caddisfly 5
Hydropsyche Net-Spinning Caddisfly 4
Simulium Black Fly 4
Stylogomphus Clubtail Dragonfly 4
Cheumatopsyche Net-Spinning Caddisfly 3
Parametriocnemus Non-Biting Midges 3
Paratanytarsus Non-Biting Midges 3
Trissopelopia Non-Biting Midges 2
Caecidotea Isopod 2
Physa Air-Breathing Freshwater Snail 2
Tubificidae Aquatic Worm 1
Antocha Crane Fly 1
Pseudolimnophila Crane Fly 1
Diamesa Bloodworm 1
Neophylax Caddisfly 1
Planariidae Flatworm 1
Chironomidae Non-Biting Midge 1
Brillia Non-Biting Midges 1
Diplocladius Non-Biting Midges 1
Eukiefferiella 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.