US Bridges

Arnold Road over Swan Creek

FairPosted for load

St. Clair County, Michigan · Sec. 3-10 Ira Twp. · Structure no. 000000000010185

Built
1975
50 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
137
2021 count
Owner
County
County Highway Agency

About this bridge

Arnold Road over Swan Creek is a prestressed concrete box beam or girders - multiple carrying Arnold Road over Swan Creek in St. Clair County, Michigan. It was built in 1975, so it is 50 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 137 vehicles a day, roughly 6% of them trucks, projected to reach 204 by 2041. The structure is 39 ft (11.8 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesArnold Road
CrossesSwan Creek
LocationSec. 3-10 Ira Twp.
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates42.70847, -82.65161
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating33.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length39 ft (11.8 m)
Longest span34 ft (10.3 m)
Deck width21 ft (6.4 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic137 (2021)
Projected traffic204 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$14,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Arnold Road over Swan Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Arnold Road over Swan Creek 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 March 2024.

How much traffic does Arnold Road over Swan Creek carry?

About 137 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is Arnold Road over Swan Creek?

The structure is 39 ft (11.8 m) long with a longest span of 34 ft (10.3 m) and a deck 21 ft wide.

Who owns Arnold Road over Swan Creek?

It is owned by the County Highway Agency.