Road Stream Crossing Site TBW_TBAC147
Thunder Bay River Watershed, Comstack Creek
Forest Service Road 4638
Mitchell Twp,
Alcona County
Information collected by:
Site Location
GPS Coordinates: 44.693459
, -83.668567
T27N
R6E
Sec 35
Owned by Federal
Fish Passability 0
Perch Height: 0.3 ft.
Total Erosion: 0.9389 tons/year
Severity: Severe
Year Inventoried: 2017
Site ID
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: Freefall into Pool
Structure Material: Metal
Structure Substrate: None
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 28 ft.
, Width 2 ft.
, Height 2 ft.
Perch Height: 0.3 ft.
Structure Inlet
Water Depth: 1.1 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.1 ft./sec.
Structure Outlet
Water Depth: 0.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 6.2 ft./sec.
*Water Velocities were measured 0.8 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 27 ft.
, Width 15 ft.
, Depth 2.7 ft.
Upstream Pond: Length 30 ft.
, Width 40 ft.
, Depth 2 ft.
Riffle Information
Water Depth: 0.35 ft.
Bankfull Width: 7.4 ft.
Wetted Width: 6 ft.
Water Velocity: 1.5 ft./sec.
(Measured with Meter)
Dominant Substrate: Gravel
Road Information
Sand
Federal Road
(Seasonal)
Road Condition: Fair
Road Width at Culvert: 8 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 2.5 ft.
Slope: 1:2
Downstream
Fill Depth: 2 ft.
Slope: 1:1
Approaches
Left Approach
Length: 352 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.47
Erosion: 0.3649 tons/year
Right Approach
Length: 209 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.246
Erosion: 0.574 tons/year
Erosion Information
Total Erosion at Crossing: 0.9389 tons/year
Extent of Erosion: Stabilized
Erosion is occurring and corrective actions can be installed to address the problem.
Summary Information
Fish Passability 0
Fish Passage is an area of concern for this site.
PERCH
These non-native species were observerd at this site: Spotted Knapweed, Canada Thistle, and Narrowleaf Cattail