US Bridges

Byron Road over Shiawassee River

FairPosted for load

Livingston County, Michigan · Sec 22 Cohoctah Twp · Structure no. 000000000005853

Built
1947
78 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
45 ft
1 main span
Daily traffic
249
2013 count
Owner
County
County Highway Agency

About this bridge

Byron Road over Shiawassee River is a steel stringer/multi-beam or girder carrying Byron Road over Shiawassee River in Livingston County, Michigan. It was built in 1947, so it is 78 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 249 vehicles a day, projected to reach 903 by 2015. The structure is 45 ft (13.7 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesByron Road
CrossesShiawassee River
LocationSec 22 Cohoctah Twp
RouteCounty Highway 0
CountyLivingston County
StateMichigan
Coordinates42.72809, -83.9684
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length45 ft (13.7 m)
Longest span40 ft (12.3 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic249 (2013)
Projected traffic903 by 2015
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Byron Road over Shiawassee River built?

It was built in 1947, making it 78 years old in 2025.

What condition is Byron Road over Shiawassee River 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 September 2024.

How much traffic does Byron Road over Shiawassee River carry?

About 249 vehicles per day (2013 count).

How long is Byron Road over Shiawassee River?

The structure is 45 ft (13.7 m) long with a longest span of 40 ft (12.3 m) and a deck 29 ft wide.

Who owns Byron Road over Shiawassee River?

It is owned by the County Highway Agency.