US Bridges

CR 931 over Sturgeon River

PoorPosted for load

St. Louis County, Minnesota · 0.8 MI N of JCT CSAH22 · Structure no. 88796

Built
1919
106 years old
Condition
Poor
inspected September 2024
Type
Truss - Thru
Steel
Length
142 ft
1 main span
Daily traffic
5
2011 count
Owner
County
County Highway Agency

About this bridge

CR 931 over Sturgeon River is a steel truss - thru carrying CR 931 over Sturgeon River in St. Louis County, Minnesota. It was built in 1919, so it is 106 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. Its operating status is: posted for load restriction.

It carries about 5 vehicles a day, projected to reach 5 by 2039. The structure is 142 ft (43.3 m) long and 18 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCR 931
CrossesSturgeon River
Location0.8 MI N of JCT CSAH22
RouteCounty Highway 931
CountySt. Louis County
StateMinnesota
Coordinates47.79253, -92.93375
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating17.2 US tons
Inventory rating13.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadUnknown
Structure length142 ft (43.3 m)
Longest span91 ft (27.7 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic5 (2011)
Projected traffic5 by 2039
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-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$1,000 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 931 over Sturgeon River built?

It was built in 1919, making it 106 years old in 2025.

What condition is CR 931 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 September 2024.

How much traffic does CR 931 over Sturgeon River carry?

About 5 vehicles per day (2011 count).

How long is CR 931 over Sturgeon River?

The structure is 142 ft (43.3 m) long with a longest span of 91 ft (27.7 m) and a deck 18 ft wide.

Who owns CR 931 over Sturgeon River?

It is owned by the County Highway Agency.