MBSS Site Summary for: ANAC-221-R-2023

Site Photos

Field photo showing stream conditions at site ANAC-221-R-2023_Midpoint_facing_downstream_doubles_as_culvert_photo (Opens in a new window) Field photo showing stream conditions at site ANAC-221-R-2023_Midpoint_facing_upstream_ (Opens in a new window)

Located on UT NORTHWEST BRANCH in the Anacostia River watershed, 8-digit code: 02140205.
This stream was visited in the spring on 3/9/2023 and again in the summer on 6/21/2023.

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 - 2.3 / 5.0
Benthic IBI Poor - 1.3 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area No data available A highly channelized urban stream with concrete banks. An example of a highly channelized urban stream.
Urban Land Use 49.3 %
Agricultural Land Use 0.4 %
Forested Land Use 49.6 %


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

Physical Stream Habitat
Instream Habitat 12/20 (Suboptimal)
Epifaunal Substrate 11/20 (Suboptimal)
Velocity/Depth Diversity 9/20 (Marginal)
Pool Quality
Pool Extent = 52 meters 		6/20 (Marginal)
Riffle Quality
Riffle Extent = 23 meters 		11/20 (Suboptimal)
Shading 50 %
Embeddedness 65 %
The embeddedness, a measure of silt on the stream bottom, was 65%. This is relatively high, and may exclude some biota.


Stream Water Quality:
Water temperature 17.9 ° C
Dissolved oxygen (DO) 6.86 mg/L
pH (lab) 7.88
Alkalinity
(acid neutralizing capacity) 		1109 µeq/L
Dissolved organic carbon (DOC) 1.77 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
Blacknose Dace 48
White Sucker 12
Green Sunfish 3
Creek Chub 2
Eastern Mosquitofish 1
Fantail Darter 1
Longnose Dace 1
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
No amphibians and reptiles noted.

Crayfish:
Cambarus bartonii
Faxonius virilis
Procambarus acutus / zonangulus

Exotic Plants:
Japanese Barberry
Japanese Stiltgrass
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
ORTHOCLADIUS Non-Biting Midges 58
CHIMARRA Fingernet Caddisfly 12
CHEUMATOPSYCHE Net-Spinning Caddisfly 8
THIENEMANNIMYIA GROUP Non-Biting Midges 5
TVETENIA Non-Biting Midges 5
MICROPSECTRA Non-Biting Midges 4
PARAMETRIOCNEMUS Non-Biting Midges 4
POLYPEDILUM Non-Biting Midges 2
ANTOCHA Crane Fly 2
THIENEMANNIELLA Non-Biting Midges 2
LUMBRICULIDAE Worm 2
AMPHINEMURA Spring Stonefly 1
PARATENDIPES European Non-Biting Midge 1
ORTHOCLADIINAE Midge 1
MEROPELOPIA 1
CRANGONYX Amphipod 1
PROSIMULIUM Black Fly 1
DIAMESA Bloodworm 1
RHEOTANYTARSUS Non-Biting Midges 1
PHAENOPSECTRA Non-Biting Midges 1
HYDROPSYCHE Net-Spinning Caddisfly 1
ABLABESMYIA Non-Biting Midge 1
CORYNONEURA Non-Biting Midges 1
CRICOTOPUS Non-Biting Midges 1
DIPLOCLADIUS 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.