Road Stream Crossing Site EUP_42N3W18_001
Carp River Watershed, Carp River
FR 3445
Mackinac County
Information collected by:
USFS
Site Location
GPS Coordinates: 46.0339260000001,-84.720152
T 042NN R 003W Sec 18
Owned by Federal
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 0.34 tons/year
Overall Score: 11
Severity: Minor
Date Inventoried: 7/28/2016
Crossing Information*
Type of Crossing: Bridge
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Other
Outlet Type: At Stream Grade
Structure Material: Wood
Structure Substrate: Mixture
General Conditions: Moderate to major deterioration from corrosion or abrasion (less than 5% of the structure has small holes or is nearly rusted through) or cracking or spalling or chipping (several small cracks or moderate chipping in the concrete). OR Moderate shape changes (described above).
Structure Interior: Other
Is Structure Rusted through? No
Dimensions of Structure: Length 18.5 ft. Width 91 ft. Height 21 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 2 ft.
Embedded Depth of Structure: 2 ft.
Water Velocity*: 1.2 ft./sec.
Structure Outlet
Water Depth: 2 ft.
Embedded Depth of Structure: 2 ft.
Water Velocity*: 1.2 ft./sec.
*Water Velocities were measured at the surface (via Float Test).
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? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 2 ft.
Bankfull Width: 69 ft.
Wetted Width: 45 ft.
Water Velocity: 1.2 ft./sec. (measured via Float Test)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Gravel
Owner: Federal
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: 16.5 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 0 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Downstream
Fill Depth: 0 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Approaches
Left Approach
Length: 100 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.17 tons/year
Right Approach
Length: 100 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.17 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.34 tons/year
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? Yes, Bridge condition because of log jam.
Were any non-native species observerd at this site? Yes, St. Johns Wort, Spotted Knapweed.
Site Comments: In stream erosion of stream bed
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.