US Bridges

Summerton RD over US-127

Fair

Isabella County, Michigan · 4.0 MI S of M-20 · Structure no. 000000000004234

Built
1965
60 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
242 ft
2 main spans
Daily traffic
160
1974 count
Owner
State
State Highway Agency

About this bridge

Summerton RD over US-127 is a steel continuous stringer/multi-beam or girder carrying Summerton RD over US-127 in Isabella County, Michigan. It was built in 1965, so it is 60 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 160 vehicles a day, projected to reach 160 by 1977. The structure is 242 ft (73.8 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSummerton RD
CrossesUS-127
Location4.0 MI S of M-20
RouteCounty Highway 3775
CountyIsabella County
StateMichigan
Coordinates43.55987, -84.72739
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.8 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 15
Structure length242 ft (73.8 m)
Longest span84 ft (25.7 m)
Deck width31 ft (9.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (1974)
Projected traffic160 by 1977
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Summerton RD over US-127 built?

It was built in 1965, making it 60 years old in 2025.

What condition is Summerton RD over US-127 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 April 2023.

How much traffic does Summerton RD over US-127 carry?

About 160 vehicles per day (1974 count).

How long is Summerton RD over US-127?

The structure is 242 ft (73.8 m) long with a longest span of 84 ft (25.7 m) and a deck 31 ft wide.

Who owns Summerton RD over US-127?

It is owned by the State Highway Agency.