M-13 & M-84 over E CHANNEL SAGINAW RIVER (Route: 13)
Num:586x
Open: no restriction [A]
Built: 1938, Reconstructed: 2005
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0.1 Miles (0.1 Kilometers)

Bridge Type
Main Span(s): Steel [3] Movable - Bascule [16]
Approach Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Epoxy Overlay [5]

Bridge Dimensions
Length: 154.8 m = 507.9 ft
Main Spans: 1 at 56.4 m = 185.0 ft
Approach Spans: 2
Skew: 0
Width, Roadway: 9.1 m = 29.9 ft (2 Lanes) and Out-To-Out: 13.7 m = 44.9 ft for a 9.1 m = 29.9 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 6 m = 19.7 ft

Location
Bay City [06020]: Bay County [017], Michigan [26]
Owned by State Highway Agency [01], DOT District: 4
IN BAY CITY (LAFAYETTE AV

Condition
Deck: Fair [5]
Superstructure: Poor [4]
Substructure: Fair [5]
Loading
Design: MS 18+Mod / HS 20+Mod [6]
Operating: 46.3 metric ton = 50.9 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Inventory: 27.9 metric ton = 30.7 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])

Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Meets minimum tolerable limits to be left in place as is [4]
Road Alignment: Meets minimum tolerable limits to be left in place as is [4]
Waterway: Somewhat better than minimum adequacy to tolerate being left in place as is [5] and Bridge is scour critical; bridge foundations determined to be unstable. [3]
Inspections
Date: April 2020 [0420] and Frequency: 15

Future Work
Work Needed:
Bridge Detour: 0.6 km = 0.4 mi
Traffic
ADT: 19666 (2007) and Trucks: 6%
Future ADT: 12550 (In 2025 )

M-13 & M-84 over W CHANNEL SAGINAW RIVER (Route: 13)
Num:587x
Open: no restriction [A]
Built: 1938, Reconstructed: 2005
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0.2 Miles (0.4 Kilometers)

Bridge Type
Main Span(s): Steel continuous [4] Stringer/Multi-beam or girder [02]
Approach Span(s): Other [00]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Latex Concrete or similar additive [3]

Bridge Dimensions
Length: 154.8 m = 507.9 ft
Main Spans: 6 at 29.9 m = 98.1 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 9.1 m = 29.9 ft (2 Lanes) and Out-To-Out: 13.7 m = 44.9 ft for a 9.1 m = 29.9 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0.3 m = 1.0 ft

Location
Bay City [06020]: Bay County [017], Michigan [26]
Owned by State Highway Agency [01], DOT District: 4
IN BAY CITY (LAFAYETTE AV

Condition
Deck: Satisfactory [6]
Superstructure: Fair [5]
Substructure: Poor [4]
Loading
Design: MS 18 / HS 20 [5]
Operating: 64.5 metric ton = 71.0 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Inventory: 38.6 metric ton = 42.5 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])

Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Meets minimum tolerable limits to be left in place as is [4]
Road Alignment: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Waterway: Somewhat better than minimum adequacy to tolerate being left in place as is [5] and Bridge is scour critical; bridge foundations determined to be unstable. [3]
Inspections
Date: March 2021 [0321] and Frequency: 24

Future Work
Work Needed: Widening of existing bridge or other major structure without deck rehabilitation or replacement [33]
Bridge Detour: 0.6 km = 0.4 mi
Traffic
ADT: 19666 (2007) and Trucks: 6%
Future ADT: 25100 (In 2025 )