Road Stream Crossing Site EUP_6337843016
Pine River Watershed, Silver Creek
Bay Road
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 46.1194435700001,-84.5916028789999
T 043NN R 002W Sec 17
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 2.56 tons/year
Overall Score: 33
Severity: Severe
Date Inventoried: 4/28/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Representative Reach
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
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.
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 63.3 ft. Width 3.2 ft. Height 2 ft.
Percentage Plugged: None or 0%
Percentage Crushed: 61% - 80%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.5 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.44 ft./sec.
Structure Outlet
Water Depth: 1.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1 ft./sec.
Additional Comments
Updated by Huron Pines. N Theisen, L Schmock
Stream Information
Stream Flow: = Bankfull – Water has completely filled the stream channel, but is not flowing onto the floodplain.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? Yes
Scour Pool: Length 70 ft., Width 41 ft., Depth 2.3 ft.
Is Upstream Ponding Present? Yes
Pond: Length 70 ft., Width 41 ft.
Riffle Information
Water Depth: 1.2 ft.
Bankfull Width: 6.5 ft.
Wetted Width: 4.4 ft.
Water Velocity: 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: Good (no symptoms of lack of integrity)
Road Width at Culvert: 20 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 6 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Downstream
Fill Depth: 7 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Approaches
Left Approach
Length: 326 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.84 tons/year
Right Approach
Length: 527 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 1.47 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 2.56 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) | ||
Left Downstream Embankment1 | 6.5 ft. | 5.5 ft. | 5.5 ft. | Yes | Gravelly Loam | Minor (corrective actions recommended) | 0.2 |
Right Upstream Embankment2 | 4 ft. | 4 ft. | 3 ft. | Yes | Gravel | Minor (corrective actions recommended) | 0.05 |
1See comments.
2Erosion above culvert area.
2Erosion above culvert area.
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? Yes, Culvert shows signs of deterioration. Some erosion around edges of culvert, may require maintenance in the future. Culvert is crushed at inlet.
Were any non-native species observerd at this site? No
Site Comments: Beaver dam upstream
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.