Road Stream Crossing Site AUS_CR081
Au Sable River Watershed, North Branch Au Sable River
Twin Bridge Rd
Lovells Twp,
Crawford County
Information collected by:
Site Location
GPS Coordinates: 44.82761
, -84.49041
T28N
R02W
Sec 13
Owned by Private
Fish Passability 0
Structure is NOT Perched
Total Erosion: 1.5958 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 4
Structure Shape: Ellipse
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Good
Multiple Culverts/Spans | ||||
Culvert/Span | Width | Length | Height | Material |
1 |
17 ft. |
53 ft. |
6.6 ft. |
Metal |
3 |
10 ft. |
52.5 ft. |
6.9 ft. |
Metal |
4 |
10 ft. |
52.5 ft. |
6.8 ft. |
Metal |
Structure Interior: corrugated
Dimensions of Structure: Length 53 ft.
, Width 17 ft.
, Height 6.6 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.6 ft./sec.
Structure Outlet
Water Depth: 1.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 5.56 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 62 ft.
, Width 76 ft.
, Depth 2.3 ft.
Upstream Pond: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 1.2 ft.
Bankfull Width: 109 ft.
Wetted Width: 97.5 ft.
Water Velocity: 3 ft./sec.
(Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Paved
County Road
Road Condition: Poor
Road Width at Culvert: 26 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2.2 ft.
Slope: 1:2
Downstream
Fill Depth: 2 ft.
Slope: 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 0.6876 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 0.6876 tons/year
Erosion Information
Total Erosion at Crossing: 1.5958 tons/year
Extent of Erosion: Moderate
Notes: Mostly foot traffic, cement barrier is cracking, and 2 cement/cracked walkways
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Downstream |
68 ft. |
4.5 ft. |
0.3 ft. |
yes |
Sand |
0.1571 |
Right Ditch |
11 ft. |
2 ft. |
0.2 ft. |
yes |
Silt |
0.0131 |
Left Downstream |
15 ft. |
6 ft. |
0.5 ft. |
yes |
Sandy Loam |
0.0504 |
Summary Information
Fish Passability 0
Fish Passage is an area of concern for this site.
High velocity water, deteriorating cement barrier and structure.
A future visit to this site is recommended. Realignment/replacement of bridge is severely needed. Replacement of cement barrier might also be needed.
These non-native species were observerd at this site: Spotted Knapweed, Queen Anne's Lace