Road Stream Crossing Site AUS_AL007

Au Sable River Watershed, Blockhouse Creek
Old State Rd
Mitchell Twp, Alcona County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.65958 , -83.883985
T26N R05E Sec 7
Owned by Private
Federal
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 1.102 tons/year
Severity: Moderate
Year Inventoried: 2012
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: Square/Rectangle
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 92 ft. , Width 13.5 ft. , Height 5.3 ft.
Percentage Plugged: Inlet: 0% Outlet: 0% In Pipe: 76% to 100%
Structure is NOT Perched
Structure Inlet
Water Depth: 3.1 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 2.5 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the Surface (with Meter)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 300 ft. , Width 227 ft. , Depth 2.8 ft.
Upstream Pond: Length 50 ft. , Width 27 ft. , Depth 3.1 ft.
Riffle Information
Water Depth: 0 ft.
Bankfull Width: 0 ft.
Wetted Width: 0 ft.
Water Velocity: 0 ft./sec. (Measured with Meter)
Dominant Substrate: Organics
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 32 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.5 ft.
Slope: More than 1:2
Downstream
Fill Depth: 5 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.603 tons/year
Right Approach
Length: 850 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.555
Erosion: 0.499 tons/year
Erosion Information
Total Erosion at Crossing: 1.102 tons/year
Summary Information
Fish Passability 0.9
Fish Passage is an area of concern for this site. Heavy beaver activity is plugging the crossing in the tube, several dams located downstream of crossing causing a large flooding area.
A future visit to this site is recommended. Headwall is deteriorating, beaver activity causing major problems as well.
These non-native species were observerd at this site: Spotted Knapweed