Road Stream Crossing Site PM_L061

Pere Marquette River Watershed, Sanborn Creek tributary
South Twin Creek Rd
Cherry Valley Twp, Lake County
Information collected by:
Site Location
GPS Coordinates: 43.9018427748386 , -85.7823108136654
T18N R12W Sec 31
Owned by Private
Total Erosion: 1.9788 tons/year
Severity: Moderate
Year Inventoried: 2014
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: At Stream Grade
Structure Material: Metal
Structure Substrate: Mixture
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 30 ft. , Width 2 ft. , Height 2 ft.
Percentage Plugged: Inlet: 1% to 25% Outlet: 0% In Pipe: 0%
Structure Inlet
Water Depth: 1.1 ft.
Embedded Depth of Structure: 0.4 ft.
Water Velocity*: 2.1 ft./sec.
Structure Outlet
Water Depth: 0.8 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 2.5 ft./sec.
*Water Velocities were measured 0.5 ft. below Surface (with Meter)
Additional Comments

Water is stagnant upstream and downstream.

Stream Information
Stream Flow: Less than 1/2 Bankfull
Upstream Pond: Length 20 ft. , Width 48 ft. , Depth 1.5 ft.
(Measured with Meter)
Dominant Substrate: Organics
Road Information
Gravel County Road
Road Condition: Fair
Road Width at Culvert: 19 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 1.5 ft.
Slope: 1:2
Downstream
Fill Depth: 2 ft.
Slope: 1:2
Approaches
Left Approach
Length: 245 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.439
Erosion: 0.563 tons/year
Right Approach
Length: 210 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.248
Erosion: 1.3718 tons/year
Erosion Information
Total Erosion at Crossing: 1.9788 tons/year
Extent of Erosion: Minor
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Approach
210 ft.
1 ft.
0.1 ft.
yes
Sand
0.0231
Right Approach
210 ft.
1 ft.
0.1 ft.
yes
Gravel
0.021
Summary Information
Erosion is an area of concern for this site.
A future visit to this site is recommended.

Inlet is blocked with muck and woody debris and road flooded during rain.