US Bridges

Mt. Morris Road over Flint River

FairPosted for load

Lapeer County, Michigan · Sec. 5-8 Oregon Twp. · Structure no. 000000000005374

Built
1953
72 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
3 main spans
Daily traffic
1,220
2020 count
Owner
County
County Highway Agency

About this bridge

Mt. Morris Road over Flint River is a steel stringer/multi-beam or girder carrying Mt. Morris Road over Flint River in Lapeer County, Michigan. It was built in 1953, so it is 72 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 1,220 vehicles a day, projected to reach 1,489 by 2040. The structure is 150 ft (45.7 m) long and 29 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesMt. Morris Road
CrossesFlint River
LocationSec. 5-8 Oregon Twp.
RouteCounty Highway 4456
CountyLapeer County
StateMichigan
Coordinates43.12714, -83.43386
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.7 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length150 ft (45.7 m)
Longest span50 ft (15.2 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,220 (2020)
Projected traffic1,489 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Mt. Morris Road over Flint River built?

It was built in 1953, making it 72 years old in 2025.

What condition is Mt. Morris Road over Flint 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 July 2023.

How much traffic does Mt. Morris Road over Flint River carry?

About 1,220 vehicles per day (2020 count).

How long is Mt. Morris Road over Flint River?

The structure is 150 ft (45.7 m) long with a longest span of 50 ft (15.2 m) and a deck 29 ft wide.

Who owns Mt. Morris Road over Flint River?

It is owned by the County Highway Agency.