US Bridges

County HWY 573 over Sturgeon River

Fair

Dickinson County, Michigan · 0.5 MI N of Loretto · Structure no. 000000000002194

Built
1945
80 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
55 ft
1 main span
Daily traffic
2,000
2020 count
Owner
County
County Highway Agency

About this bridge

County HWY 573 over Sturgeon River is a steel stringer/multi-beam or girder carrying County HWY 573 over Sturgeon River in Dickinson County, Michigan. It was built in 1945, so it is 80 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 2,000 vehicles a day, roughly 5% of them trucks, projected to reach 2,100 by 2040. The structure is 55 ft (16.9 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCounty HWY 573
CrossesSturgeon River
Location0.5 MI N of Loretto
RouteCounty Highway 2259
CountyDickinson County
StateMichigan
Coordinates45.79005, -87.81662
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating72.9 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length55 ft (16.9 m)
Longest span53 ft (16.1 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2020)
Projected traffic2,100 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$385,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County HWY 573 over Sturgeon River built?

It was built in 1945, making it 80 years old in 2025.

What condition is County HWY 573 over Sturgeon River 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 County HWY 573 over Sturgeon River carry?

About 2,000 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is County HWY 573 over Sturgeon River?

The structure is 55 ft (16.9 m) long with a longest span of 53 ft (16.1 m) and a deck 29 ft wide.

Who owns County HWY 573 over Sturgeon River?

It is owned by the County Highway Agency.