Road Stream Crossing Site EUP_MCW23
Les Cheneaux Islands Watershed, Beaver Tail Creek
S Prentiss Bay Road
Chippewa County
Information collected by:
Site Location
GPS Coordinates: 45.9951383,-84.2153468
T 042N R 002 Sec 32
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 0.17 tons/year
Overall Score: 37
Severity: Severe
Date Inventoried: 5/14/2021
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: 3 or More
Structure Shape: Ellipse
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Major deterioration from corrosion or abrasion (5-10% of the structure is rusted through) or cracking or spalling or chipping (medium sized cracks, widespread chipping, exposed metal reinforcement). OR Major shape changes (described above) reducing the capacity of the structure by less than 30%. OR segment disconnection (segments of concrete or metal culvert disconnecting internally) but no evidence of water piping.
Additional (Multiple) Structures | ||||
Structure | Width | Length | Height | Material |
2 | 2 ft. | 34 ft. | 1.6 ft. | Metal |
1 | 2 ft. | 30 ft. | 1.5 ft. | Metal |
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 31 ft. Width 3 ft. Height 1.9 ft.
Percentage Plugged: 1% - 20% Inlet,Outlet
Percentage Crushed: 1% - 20%
Structure is NOT Perched
Structure Inlet
Water Depth: 2.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1 ft./sec.
Structure Outlet
Water Depth: 1.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.4 ft./sec.
*Water Velocities were measured 2.4 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? Yes
Scour Pool: Length 15 ft., Width 9 ft., Depth 1.6 ft.
Is Upstream Ponding Present? Yes
Pond: Length 12 ft., Width 27 ft.
Riffle Information
Water Depth: 1.2 ft.
Bankfull Width: 14.4 ft.
Wetted Width: 12.4 ft.
Water Velocity: 1.1 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Gravel
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: 17 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 1.4 ft.
Slope: Vertical, 0:1, or 90°
Downstream
Fill Depth: 1 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: 300 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.07 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.17 tons/year
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Extent of Erosion | Estimated Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | ||
Road at Crossing1 | 3 ft. | 3 ft. | 1 ft. | Yes | Gravel | Moderate (corrective actions recommended) | 0.03 |
Road at Crossing2 | 3 ft. | 1 ft. | 1 ft. | Yes | Gravel | Moderate (corrective actions recommended) | 0.01 |
Road at Crossing3 | 4 ft. | 4 ft. | 1 ft. | Yes | Gravel | Moderate (corrective actions recommended) | 0.06 |
1Replacement of crossing with adequate structure would fix the erosion issue.
2Replace structure
3Replace structure
2Replace structure
3Replace structure
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? Yes, Culverts need to be replaced.
Were any non-native species observerd at this site? No
Site Comments: 3 undersized culverts Road overtopping
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.