Road Stream Crossing Site PM_M065

Pere Marquette River Watershed, Pere Marquette tributary
Conrad Rd
Custer Twp, Mason County
Information collected by:
Site Location
GPS Coordinates: 43.93312 , -86.23711
T18N R16W Sec 21
Owned by Private
Fish Passability 0
Perch Height: 0.6 ft.
Total Erosion: 1.2937 tons/year
Severity: Severe
Year Inventoried: 2014
Inlet
Outlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Erosion
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Apron
Outlet Type: Outlet Apron
Structure Material: Concrete
Structure Substrate: None
General Conditions: Poor
Structure Interior: smooth
Dimensions of Structure: Length 120 ft. , Width 3 ft. , Height 3 ft.
Perch Height: 0.6 ft.
Structure Inlet
Water Depth: 0.3 ft.
Water Velocity*: 0.9 ft./sec.
Structure Outlet
Water Depth: 0.5 ft.
Water Velocity*: 1.1 ft./sec.
*Water Velocities were measured 0.2 ft. below Surface (with Meter)
Additional Comments
outlet apron fell off-lies 8ft from culvert
Stream Information
Stream Flow: Less than 1/2 Bankfull
Scour Pool: Length 10 ft. , Width 10 ft. , Depth 3 ft.
Riffle Information
Water Depth: 0.3 ft.
Bankfull Width: 12 ft.
Wetted Width: 4 ft.
Water Velocity: 1.5 ft./sec. (Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 24 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 30 ft.
Slope: 1:1.5
Downstream
Fill Depth: 35 ft.
Slope: 1:1.5
Approaches
Left Approach
Length: 330 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.439
Erosion: 0.3768 tons/year
Right Approach
Length: 450 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.583
Erosion: 0.565 tons/year
Erosion Information
Total Erosion at Crossing: 1.2937 tons/year
Extent of Erosion: Severe
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Upstream Embankment
10 ft.
20 ft.
1 ft.
yes
Loam
0.176
Left Upstream Embankment
10 ft.
20 ft.
1 ft.
yes
Loam
0.176
Summary Information
Fish Passability 0
Erosion is an area of concern for this site.
A future visit to this site is recommended. erosion and culvert outlet apron broken off