Road Stream Crossing Site TW066
Tawas River Watershed, Tawas Lake Tributarty
Bischoff Rd
Tawas Twp,
Iosco County
Information collected by:
Site Location
GPS Coordinates: 44.32528
, -83.54335
T22N
R07E
Sec 1,2
Owned by Private
Fish Passability 0
Perch Height: 0.5 ft.
Total Erosion: 2.8661 tons/year
1.2 Upstream Miles
Severity: Severe
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: 1
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: Freefall into Pool
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 50 ft.
, Width 2.6 ft.
, Height 2.6 ft.
Perch Height: 0.5 ft.
Structure Inlet
Water Depth: 0.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.1 ft./sec.
Structure Outlet
Water Depth: 0.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.1 ft./sec.
*Water Velocities were measured at the Surface
(with Meter)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 20 ft.
, Width 9.2 ft.
, Depth 1.5 ft.
Upstream Pond: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 0.1 ft.
Bankfull Width: 9 ft.
Wetted Width: 2 ft.
Water Velocity: 0.2 ft./sec.
(Measured with Meter)
Dominant Substrate: Sand
Road Information
Gravel
County Road
Road Condition: Fair
Road Width at Culvert: 17 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 6.3 ft.
Slope: 1:2
Downstream
Fill Depth: 7 ft.
Slope: 1:2
Approaches
Left Approach
Length: 450 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.49
Erosion: 1.0326 tons/year
Right Approach
Length: 400 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.48
Erosion: 0.8992 tons/year
Erosion Information
Total Erosion at Crossing: 2.8661 tons/year
Extent of Erosion: Severe
Notes: Right downstream embankment erosion is sediment runoff from the road.
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Upstream Streambank |
3.2 ft. |
2.2 ft. |
1.4 ft. |
yes |
Loam |
0.0788 |
Left Downstream Embankment |
3 ft. |
2.4 ft. |
4.8 ft. |
yes |
Sand |
0.3168 |
Right Downstream Streambank |
4.2 ft. |
4.5 ft. |
2.8 ft. |
yes |
Sand |
0.2587 |
Right Downstream Embankment |
14 ft. |
1.4 ft. |
1 ft. |
no |
Gravel |
0.28 |
Summary Information
Fish Passability 0
1.2 Upstream Miles
Erosion is an area of concern for this site.
multiple erosion sites at crossing causing sediment to enter the stream
A future visit to this site is recommended. Erosion issues, also the outlet is perched