Road Stream Crossing Site AUS_PR049
Au Sable River Watershed, East branch Pine River
N McConnel Rd
Hawes Twp,
Alcona County
Information collected by:
Site Location
GPS Coordinates: 44.6906448,-83.4448887
T 027N R 008 Sec 34
Fish Passability: Potential Behavioral Barrier
Structure is NOT Perched
Total Erosion: 2.87 tons/year
Overall Score: 23
Severity: Moderate
Date Inventoried: 4/13/2022
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Pipe Arch
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: No deficiencies. New structure or nearly new condition.
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 84 ft. Width 9 ft. Height 6.5 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 2.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.5 ft./sec.
Structure Outlet
Water Depth: 1.2 ft.
Embedded Depth of Structure: 1 ft.
Water Velocity*: 0.4 ft./sec.
*Water Velocities were measured 0.2 ft. below the surface (via Flow Meter).
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? Yes
Pond: Length 115 ft., Width 13.5 ft.
Riffle Information
Water Depth: 1.3 ft.
Bankfull Width: 13 ft.
Wetted Width: 9.5 ft.
Water Velocity: 1.1 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: 22 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 5.2 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 5.5 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Approaches
Left Approach
Length: 1000 ft.
Slope: 6-10%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 2.29 tons/year
Right Approach
Length: 1000 ft.
Slope: 6-10%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.58 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 2.87 tons/year
Summary Information
Fish Passability: Potential Behavioral Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Mullein, spotted knapweed.
Site Comments: Unknown cause of ponding. Culvert is recently replaced so it could be from previous structure.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.