US Bridges

Wyman Road over South Br Chippewa River

PoorPosted for load

Isabella County, Michigan · Sec 20-21 Sherman Twp · Structure no. 000000000004370

Built
1941
84 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
54 ft
1 main span
Daily traffic
81
2024 count
Owner
County
County Highway Agency

About this bridge

Wyman Road over South Br Chippewa River is a steel stringer/multi-beam or girder carrying Wyman Road over South Br Chippewa River in Isabella County, Michigan. It was built in 1941, so it is 84 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 81 vehicles a day, roughly 17% of them trucks, projected to reach 99 by 2044. The structure is 54 ft (16.4 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesWyman Road
CrossesSouth Br Chippewa River
LocationSec 20-21 Sherman Twp
RouteCounty Highway 0
CountyIsabella County
StateMichigan
Coordinates43.68295, -85.04788
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating42 US tons
Inventory rating25.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length54 ft (16.4 m)
Longest span50 ft (15.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2024)
Projected traffic99 by 2044
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$374,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Wyman Road over South Br Chippewa River built?

It was built in 1941, making it 84 years old in 2025.

What condition is Wyman Road over South Br Chippewa River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does Wyman Road over South Br Chippewa River carry?

About 81 vehicles per day (2024 count), of which roughly 17% are trucks.

How long is Wyman Road over South Br Chippewa River?

The structure is 54 ft (16.4 m) long with a longest span of 50 ft (15.2 m) and a deck 26 ft wide.

Who owns Wyman Road over South Br Chippewa River?

It is owned by the County Highway Agency.