US Bridges

County Road P448 over West Branch Manistique

FairPosted for load

Schoolcraft County, Michigan · 13 MI S of M-28 · Structure no. 000000000009708

Built
1967
58 years old
Condition
Fair
inspected June 2023
Type
Slab
Wood or Timber
Length
76 ft
3 main spans
Daily traffic
100
2020 count
Owner
County
County Highway Agency

About this bridge

County Road P448 over West Branch Manistique is a wood or timber slab carrying County Road P448 over West Branch Manistique in Schoolcraft County, Michigan. It was built in 1967, so it is 58 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 15% of them trucks, projected to reach 148 by 2040. The structure is 76 ft (23.1 m) long and 26 ft wide. If it were closed, the detour would be 53.4 mi (86 km).

Location

Open in Google Maps
CarriesCounty Road P448
CrossesWest Branch Manistique
Location13 MI S of M-28
RouteCounty Highway 7535
CountySchoolcraft County
StateMichigan
Coordinates46.17233, -86.21024
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating52.5 US tons
Inventory rating37.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20 + Mod
Structure length76 ft (23.1 m)
Longest span26 ft (7.9 m)
Deck width26 ft (7.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2020)
Projected traffic148 by 2040
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed53.4 mi (86 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road P448 over West Branch Manistique built?

It was built in 1967, making it 58 years old in 2025.

What condition is County Road P448 over West Branch Manistique in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does County Road P448 over West Branch Manistique carry?

About 100 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is County Road P448 over West Branch Manistique?

The structure is 76 ft (23.1 m) long with a longest span of 26 ft (7.9 m) and a deck 26 ft wide.

Who owns County Road P448 over West Branch Manistique?

It is owned by the County Highway Agency.