Road Stream Crossing Site PM_M092
Pere Marquette River Watershed, Swan Creek tributary
Schwass Rd
Riverton Twp,
Mason County
Information collected by:
Site Location
GPS Coordinates: 43.89505
, -86.31849
T17N
R17W
Sec 2
Owned by Private
Fish Passability 0
Perch Height: 2 ft.
Total Erosion: 3.5292 tons/year
Severity: Severe
Year Inventoried: 2014
Inlet
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: Projecting
Outlet Type: Freefall into Pool
Structure Material: Metal
Structure Substrate: None
General Conditions: Poor
Structure Interior: corrugated
Dimensions of Structure: Length 50 ft.
, Width 2.5 ft.
, Height 2.5 ft.
Perch Height: 2 ft.
Water Depth: 0 ft.
Water Velocity*: 0 ft./sec.
Water Depth: 0 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the Surface
(with Meter)
Additional Comments
inlet blocked by logs
lots of erosion all over outlet area
Stream Information
Stream Flow: None
Scour Pool: Length 12 ft.
, Width 8 ft.
, Depth 4 ft.
Riffle Information
Water Depth: 0 ft.
Water Velocity: 0 ft./sec.
Road Information
Gravel
County Road
Road Condition: Fair
Road Width at Culvert: 22 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 15 ft.
Slope: Vertical
Downstream
Fill Depth: 15 ft.
Slope: Vertical
Approaches
Left Approach
Length: 240 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.302
Erosion: 1.8938 tons/year
Right Approach
Length: 160 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.142
Erosion: 1.1074 tons/year
Erosion Information
Total Erosion at Crossing: 3.5292 tons/year
Extent of Erosion: Severe
Notes: road drainpipe is very weak due to eroding bank giving no support
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Downstream Embankment |
20 ft. |
10 ft. |
1.5 ft. |
yes |
Loam |
0.528 |
Summary Information
Fish Passability 0
Erosion is an area of concern for this site.
erosion at outlet and inlet blocked
A future visit to this site is recommended. see above and perched outlet