US Bridges

Csah 120 over Bear Island River

Fair

St. Louis County, Minnesota · 1.2 MI E of JCT CSAH21 · Structure no. 69621

Built
1998
27 years old
Condition
Fair
inspected July 2023
Type
Slab
Wood or Timber
Length
60 ft
3 main spans
Daily traffic
370
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 120 over Bear Island River is a wood or timber slab carrying Csah 120 over Bear Island River in St. Louis County, Minnesota. It was built in 1998, so it is 27 years old, younger 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 6 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 370 vehicles a day, projected to reach 360 by 2039. The structure is 60 ft (18.3 m) long and 38 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesCsah 120
CrossesBear Island River
Location1.2 MI E of JCT CSAH21
RouteCounty Highway 120
Coordinates47.79927, -91.86959
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.2 US tons
Inventory rating50.4 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 25 or greater
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width38 ft (11.5 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic370 (2019)
Projected traffic360 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Csah 120 over Bear Island River built?

It was built in 1998, making it 27 years old in 2025.

What condition is Csah 120 over Bear Island 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 July 2023.

How much traffic does Csah 120 over Bear Island River carry?

About 370 vehicles per day (2019 count).

How long is Csah 120 over Bear Island River?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 38 ft wide.

Who owns Csah 120 over Bear Island River?

It is owned by the County Highway Agency.