US Bridges

Isabella RD over US-127

Fair

Isabella County, Michigan · 0.7 MI N of M-20 · Structure no. 000000000004253

Built
1964
61 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
230 ft
4 main spans
Daily traffic
110
1974 count
Owner
State
State Highway Agency

About this bridge

Isabella RD over US-127 is a steel stringer/multi-beam or girder carrying Isabella RD over US-127 in Isabella County, Michigan. It was built in 1964, so it is 61 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.

It carries about 110 vehicles a day, roughly 3% of them trucks, projected to reach 110 by 1977. The structure is 230 ft (70.1 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIsabella RD
CrossesUS-127
Location0.7 MI N of M-20
RouteCounty Highway 2024
CountyIsabella County
StateMichigan
Coordinates43.61829, -84.74811
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length230 ft (70.1 m)
Longest span80 ft (24.3 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (1974)
Projected traffic110 by 1977
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 Isabella RD over US-127 built?

It was built in 1964, making it 61 years old in 2025.

What condition is Isabella 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 Isabella RD over US-127 carry?

About 110 vehicles per day (1974 count), of which roughly 3% are trucks.

How long is Isabella RD over US-127?

The structure is 230 ft (70.1 m) long with a longest span of 80 ft (24.3 m) and a deck 33 ft wide.

Who owns Isabella RD over US-127?

It is owned by the State Highway Agency.