Road Stream Crossing Site TBW_TBMO60
Thunder Bay River Watershed, Gilchirst Creek
Harwood Rd
Loud Twp,
Montmorency County
Information collected by:
Site Location
GPS Coordinates: 44.9137000000001,-84.0475
T Loud TwpN R 3E Sec 11
Owned by Private
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 0.9 tons/year
Overall Score: 6
Severity: Severe
Date Inventoried: 4/25/2022
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: Open Bottom Square/Rectangle
Inlet Type: Wingwall 30 to 70 degrees
Outlet Type: At Stream Grade
Structure Material: Wood
Structure Substrate: None
General Conditions: No deficiencies. New structure or nearly new condition.
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 32 ft. Width 31 ft. Height 6 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 2.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.5 ft./sec.
Structure Outlet
Water Depth: 2.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.3 ft./sec.
*Water Velocities were measured 1 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? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 1.3 ft.
Bankfull Width: 30 ft.
Wetted Width: 25 ft.
Water Velocity: 3.8 ft./sec. (measured via Flow Meter)
Dominant Substrate: Gravel – rocks between the size of a pinhead and a baseball
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 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: 1000 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.55 tons/year
Right Approach
Length: 678 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.35 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.9 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, Spotted Knapweed, burdock, mullein.
Site Comments: Crossing replaced in 2021. Re-inventory conducted in April 2022. New timber bridge allows aquatic orgaism passage and natural flow conditions.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.