Road Stream Crossing Site TW061

Tawas River Watershed, Tributary to Tawas River
Nunn Rd
Baldwin Twp, Iosco County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.28317 , -83.50585
T22N R08E Sec 19
Owned by Private
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 0.2092 tons/year
Severity: Moderate
Year Inventoried: 2012
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 2
Structure Shape: Ellipse
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Fair
Multiple Culverts/Spans
Culvert/Span
Width
Length
Height
Material
1
4.3 ft.
70 ft.
3.2 ft.
Metal
2
4.3 ft.
70 ft.
3.2 ft.
Metal
Structure Interior: corrugated
Dimensions of Structure: Length 70 ft. , Width 4.3 ft. , Height 3.4 ft.
Percentage Plugged: Inlet: 1% to 25% Outlet: 0% In Pipe: 0%
Percentage Crushed: Inlet: 1% to 25% Outlet: 0% In Pipe: 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 0.9 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the Surface (with Meter)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 2 ft.
Bankfull Width: 60 ft.
Wetted Width: 35 ft.
Water Velocity: 2.2 ft./sec. (Measured with Meter)
Dominant Substrate: Clay
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 40 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 5.5 ft.
Slope: More than 1:2
Downstream
Fill Depth: 5.2 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.0661 tons/year
Right Approach
Length: 1000 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.0661 tons/year
Erosion Information
Total Erosion at Crossing: 0.2092 tons/year
Extent of Erosion: Moderate
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Downstream Embankment
11 ft.
8 ft.
1 ft.
yes
Gravel
0.077
Summary Information
Fish Passability 0.9
Erosion is an area of concern for this site. Downstream side erosion site
A future visit to this site is recommended. Erosion issues