US Bridges

Sentry Drive over Canadian National Railro

Fair

Calhoun County, Michigan · 0.3 Miles East of Gate at · Structure no. AFMIMBMV07001

Built
2002
23 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
196 ft
3 main spans
Daily traffic
150
2014 count
Owner
Federal
Air Force

About this bridge

Sentry Drive over Canadian National Railro is a prestressed concrete box beam or girders - multiple carrying Sentry Drive over Canadian National Railro in Calhoun County, Michigan. It was built in 2002, so it is 23 years old, younger 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 150 vehicles a day, projected to reach 180 by 2034. The structure is 196 ft (59.7 m) long and 37 ft wide.

CarriesSentry Drive
CrossesCanadian National Railro
Location0.3 Miles East of Gate at
Coordinates42.30997, -85.26011
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.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating81 US tons
Inventory rating52 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length196 ft (59.7 m)
Longest span72 ft (21.9 m)
Deck width37 ft (11.3 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2014)
Projected traffic180 by 2034
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerAir Force
Maintained byAir Force
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 Sentry Drive over Canadian National Railro built?

It was built in 2002, making it 23 years old in 2025.

What condition is Sentry Drive over Canadian National Railro 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 Sentry Drive over Canadian National Railro carry?

About 150 vehicles per day (2014 count).

How long is Sentry Drive over Canadian National Railro?

The structure is 196 ft (59.7 m) long with a longest span of 72 ft (21.9 m) and a deck 37 ft wide.

Who owns Sentry Drive over Canadian National Railro?

It is owned by the Air Force.