US Bridges

Ut 921 over Sturgeon River

Poor

St. Louis County, Minnesota · 1.8 MI E of JCT Csah 5 · Structure no. 69579

Built
1986
39 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
166 ft
3 main spans
Daily traffic
15
2011 count
Owner
County
County Highway Agency

About this bridge

Ut 921 over Sturgeon River is a steel continuous stringer/multi-beam or girder carrying Ut 921 over Sturgeon River in St. Louis County, Minnesota. It was built in 1986, so it is 39 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 15 vehicles a day, projected to reach 15 by 2039. The structure is 166 ft (50.6 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesUt 921
CrossesSturgeon River
Location1.8 MI E of JCT Csah 5
RouteCounty Highway 921
Coordinates47.80693, -92.97961
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating69.8 US tons
Inventory rating41.8 US tons

Structure

MaterialSteel Continuous
DeckWood or timber
Main spans3
Design loadHS 20
Structure length166 ft (50.6 m)
Longest span66 ft (20.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2011)
Projected traffic15 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Ut 921 over Sturgeon River built?

It was built in 1986, making it 39 years old in 2025.

What condition is Ut 921 over Sturgeon River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does Ut 921 over Sturgeon River carry?

About 15 vehicles per day (2011 count).

How long is Ut 921 over Sturgeon River?

The structure is 166 ft (50.6 m) long with a longest span of 66 ft (20.1 m) and a deck 30 ft wide.

Who owns Ut 921 over Sturgeon River?

It is owned by the County Highway Agency.