Road Stream Crossing Site EUP_MRW39
Munuscong River Watershed, Munuscong River
3 Mile Rd
Mackinac County
Information collected by:
Site Location
GPS Coordinates: 46.1393819,-84.4257482
T 043N R 001 Sec 09
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 6.49 tons/year
Overall Score: 19
Severity: Moderate
Date Inventoried: 8/25/2021
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: Other
Inlet Type: Other
Outlet Type: Cascade Over Riprap
Structure Material: Concrete
Structure Substrate: None
General Conditions: Light superficial corrosion or abrasion or chipping or spalling or cracking. No shape changes (described above).
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 30.5 ft. Width 110 ft. Height 17.7 ft.
Percentage Plugged: 41% - 60% Inside
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 3.4 ft.
Embedded Depth of Structure: 8 ft.
Water Velocity*: 0.6 ft./sec.
Structure Outlet
Water Depth: 0.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3 ft./sec.
*Water Velocities were measured 0.6 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 40 ft., Width 20 ft., Depth 3 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 2 ft.
Bankfull Width: 43 ft.
Wetted Width: 35 ft.
Water Velocity: 0.1 ft./sec. (measured via Flow Meter)
Dominant Substrate: Clay – very fine particles that stick together
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: 29.5 ft.
Location of Low Point: At Stream
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: 850 ft.
Slope: 6-10%
Erosion Estimate: 3.65 tons/year
Right Approach
Length: 730 ft.
Slope: 6-10%
Erosion Estimate: 2.84 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 6.49 tons/year
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Leafy spurge, wild carrot, knapweed.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.