Road Stream Crossing Site TBW_TBMO67
Thunder Bay River Watershed, Hunt Creek
Schmallers Rd
Avery Twp,
Montmorency County
Information collected by:
Site Location
GPS Coordinates: 44.9428572,-84.0678122
T 030N R 003 Sec 34
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 0.26 tons/year
Overall Score: 6
Severity: Minor
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 27.5 ft. Width 36 ft. Height 5.3 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4.5 ft./sec.
Structure Outlet
Water Depth: 2.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.8 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: 1.7 ft.
Bankfull Width: 27.6 ft.
Wetted Width: 26.5 ft.
Water Velocity: 3.9 ft./sec. (measured via Float Test)
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: 20 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: 390 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.12 tons/year
Right Approach
Length: 400 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.13 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.26 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) | ||
Right Upstream Embankment | 20 ft. | 1 ft. | 0.5 ft. | No | Sandy Loam | Minor (corrective actions recommended) | 0.01 |
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? No
Site Comments: Timber bridge installed in 2021. Crossing was re-inventoried in April 2022. Crossing is not a fish barrier. Small, faster-flowing riffle immediatrly upstream of bridge has a higher velocity during springtime.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.