Road Stream Crossing Site CLHW_LBR-011
Little Black River Watershed, Unnamed Branch of Little Black River
Riggsville Rd
Inverness Twp,
Cheboygan County
Information collected by:
Site Location
GPS Coordinates: 45.63406
, -84.50845
T37N
R2W
Sec 2
Owned by Private
Structure is NOT Perched
Total Erosion: 0.4522 tons/year
Severity: Minor
Year Inventoried: 2016
Site ID
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Gravel
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 50 ft.
, Width 12.2 ft.
, Height 7.5 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.2 ft./sec.
Structure Outlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.2 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Additional Comments
Riffle unavailable due to constant blockages in river
Stream Information
Stream Flow: Less than 1/2 Bankfull
Road Information
Gravel
County Road
Road Condition: Fair
Road Width at Culvert: 28 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Approaches
Left Approach
Length: 0 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0 tons/year
Right Approach
Length: 147 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.399
Erosion: 0.4522 tons/year
Erosion Information
Total Erosion at Crossing: 0.4522 tons/year
Summary Information
Fish Passage is an area of concern for this site.
Culvert is in good condition, however up and down stream of crossing is extremely obstructed by vegetation
A future visit to this site is recommended. Possibly to clear some of the blockages that have formed
These non-native species were observerd at this site: Honeysuckle