US Bridges

Csah 10 over Lester River

FairPosted for load

St. Louis County, Minnesota · 0.4 MI W of JCT CSAH12 · Structure no. 6667

Built
1948
77 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
64 ft
1 main span
Daily traffic
730
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 10 over Lester River is a steel stringer/multi-beam or girder carrying Csah 10 over Lester River in St. Louis County, Minnesota. It was built in 1948, so it is 77 years old, older than the Minnesota average of 38.5 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 730 vehicles a day, projected to reach 740 by 2039. The structure is 64 ft (19.5 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCsah 10
CrossesLester River
Location0.4 MI W of JCT CSAH12
RouteCounty Highway 10
CountySt. Louis County
StateMinnesota
Coordinates46.88765, -91.99162
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 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 rating29.8 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span59 ft (18.1 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic730 (2019)
Projected traffic740 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$273 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 10 over Lester River built?

It was built in 1948, making it 77 years old in 2025.

What condition is Csah 10 over Lester 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 June 2024.

How much traffic does Csah 10 over Lester River carry?

About 730 vehicles per day (2019 count).

How long is Csah 10 over Lester River?

The structure is 64 ft (19.5 m) long with a longest span of 59 ft (18.1 m) and a deck 29 ft wide.

Who owns Csah 10 over Lester River?

It is owned by the County Highway Agency.