US Bridges

County Road I 18 over Rapid River

Good

Delta County, Michigan · 3 MI N of Rapid River · Structure no. 000000000002166

Built
2014
11 years old
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
67 ft
2 main spans
Daily traffic
158
2021 count
Owner
County
County Highway Agency

About this bridge

County Road I 18 over Rapid River is a prestressed concrete box beam or girders - multiple carrying County Road I 18 over Rapid River in Delta County, Michigan. It was built in 2014, so it is 11 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 158 vehicles a day, roughly 5% of them trucks, projected to reach 174 by 2041. The structure is 67 ft (20.5 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road I 18
CrossesRapid River
Location3 MI N of Rapid River
RouteCounty Highway 0
CountyDelta County
StateMichigan
Coordinates45.97069, -86.95731
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating64.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length67 ft (20.5 m)
Longest span32 ft (9.8 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic158 (2021)
Projected traffic174 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 County Road I 18 over Rapid River built?

It was built in 2014, making it 11 years old in 2025.

What condition is County Road I 18 over Rapid River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does County Road I 18 over Rapid River carry?

About 158 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is County Road I 18 over Rapid River?

The structure is 67 ft (20.5 m) long with a longest span of 32 ft (9.8 m) and a deck 28 ft wide.

Who owns County Road I 18 over Rapid River?

It is owned by the County Highway Agency.