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:
Huron Pines
Site Location
GPS Coordinates: 44.8276100000001,-84.4904099999999
T Lovells TwpN R 2W Sec 13
Owned by Private
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 1.5 tons/year
Overall Score: 32
Severity: Severe
Date Inventoried: 5/25/2022
Road Approach - Left
Road Approach - Left
Road Approach - Right
Road Approach - Right
Inlet
Inlet
Upstream Conditions
Upstream Conditions
Representative Reach
Representative Reach
Other
Other
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 3 or More
Structure Shape: Pipe Arch
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Moderate to major deterioration from corrosion or abrasion (less than 5% of the structure has small holes or is nearly rusted through) or cracking or spalling or chipping (several small cracks or moderate chipping in the concrete). OR Moderate shape changes (described above).
Additional (Multiple) Structures
Structure
Width
Length
Height
Material
1
10 ft.
53.5 ft.
7 ft.
Metal
2
10 ft.
53.5 ft.
7 ft.
Metal
3
10 ft.
53.5 ft.
7 ft.
Metal
4
10 ft.
53.5 ft.
7 ft.
Metal
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 53.5 ft. Width 10 ft. Height 7 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4.2 ft./sec.
Structure Outlet
Water Depth: 1.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 5 ft./sec.
*Water Velocities were measured 1.4 ft. below the surface (via Flow Meter).
Stream Information
Stream Flow: < 1/2 Bankfull The stream channel is less than half filled with water.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? Yes
Scour Pool: Length 62 ft., Width 76 ft., Depth 2.5 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 1.8 ft.
Bankfull Width: 56.5 ft.
Wetted Width: 58.5 ft.
Water Velocity: 3.5 ft./sec. (measured via Flow Meter)
Dominant Substrate: Gravel rocks between the size of a pinhead and a baseball
Road Information
Road Surface: Paved
Owner: County
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Core Integrity: Good (no symptoms of lack of integrity)
Road Width at Culvert: 28.5 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 1.4 ft.
Slope: Steep, 1:1, 45, or 100%
Downstream
Fill Depth: 1.4 ft.
Slope: Steep, 1:1, 45, or 100%
Approaches
Left Approach
Length: 1000 ft.
Slope: 1-5%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.75 tons/year
Right Approach
Length: 1000 ft.
Slope: 1-5%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.75 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 1.5 tons/year
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? Yes
Were any non-native species observerd at this site? Yes, Spotted Knapweed, Queen Anne's Lace.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.