Road Stream Crossing Site AUS_CR021
Au Sable River Watershed, East Branch Au Sable River
US 23
Grayling Twp,
Crawford County
Information collected by:
Site Location
GPS Coordinates: 44.72826,-84.64404
T 027N R 003 Sec 23
Owned by State, Private
Fish Passability: Not a Barrier
Structure is NOT Perched
Overall Score: 4
Severity: Minor
Date Inventoried: 4/15/2022
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Site Sketch
Crossing Information*
Type of Crossing: Bridge
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 30 to 70 degrees
Outlet Type: At Stream Grade
Structure Material: Wood
Structure Substrate: None
General Conditions: No deficiencies. New structure or nearly new condition.
Structure Interior: Smooth
Dimensions of Structure: Length 30 ft. Width 30 ft. Height 6 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 3.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1 ft./sec.
Structure Outlet
Water Depth: 3.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.4 ft./sec.
*Water Velocities were measured 0.2 ft. below the surface (via Flow Meter).
Additional Comments
State land to the north of crossing and private to the south
Stream Information
Stream Flow: < Bankfull – The stream channel is more than half filled with water, but is not full.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 1.9 ft.
Bankfull Width: 32 ft.
Wetted Width: 27 ft.
Water Velocity: 2.1 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
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: 29 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 0 ft.
Slope: Vertical, 0:1, or 90°
Downstream
Fill Depth: 0 ft.
Slope: Vertical, 0:1, or 90°
Approaches
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0 tons/year
Right Approach
Length: 0 ft.
Slope: < 1%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Information
Summary Information
Fish Passability: Not a Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Spotted Knapweed.
Site Comments: Timber bridge. TV and Computer dumped in the inlet of the river.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.