Road Stream Crossing Site EUP_Blair Road/Rutledge
Munuscong River Watershed, Unnamed
Blair Rd/Rutledge Rd
Mackinac County
Information collected by:
CLMCD
Site Location
GPS Coordinates: 46.1435987,-84.4047011
T 43NN R 01W Sec 11
Owned by Dan Nettleton
Fish Passability: Barrier
Perch Height: 0.7 ft.
Total Erosion: 0.53 tons/year
Overall Score: 42
Severity: Severe
Date Inventoried: 8/24/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Other
Other
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Rock
General Conditions: Severe deterioration from corrosion or abrasion (more than 50% of the structure is rusted through) or cracking or spalling or chipping (more than 50% of the structure is compromised). Or Major shape changes (described above) reducing the capacity of the structure by greater than 50%. OR Segment disconnect causing major subsurface erosion/piping and/or partial fill failure and/or sink holes in the fill.
Structure Interior: Corrugated
Is Structure Rusted through? Yes
Dimensions of Structure: Length 86 ft. Width 10 ft. Height 10.5 ft.
Percentage Plugged: 61% - 80% Inlet
Percentage Crushed: 41% - 60%
Perch Height: 0.7 ft.
Structure Inlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0.7 ft.
Structure Outlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0.2 ft.
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 21 ft., Width 16 ft., Depth 0.2 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 0.8 ft.
Bankfull Width: 13 ft.
Wetted Width: 11 ft.
Dominant Substrate: Clay – very fine particles that stick together
Road Information
Road Surface: Paved
Owner: County
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Core Integrity: Fair (some of the symptoms may be present, but not to an extent posing high risk to the crossing)
Road Width at Culvert: 32 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 7.5 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Downstream
Fill Depth: 8.5 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Approaches
Left Approach
Length: 400 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.2 tons/year
Right Approach
Length: 600 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.33 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.53 tons/year
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? Yes, Risk of road failure, erosion, aquatic organism passage.
Were any non-native species observerd at this site? Yes, Spotted Knapweed.
Site Comments: culvert failure and cattle crossing. actice restoration in progress. Culvert is putting future reatoration at risk.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.