US Bridges

Csah 12 over Ann River

Fair

Kanabec County, Minnesota · 1.4 MI SW of JCT Csah 6 · Structure no. 33521

Built
1981
44 years old
Condition
Fair
inspected November 2023
Type
Slab
Wood or Timber
Length
124 ft
4 main spans
Daily traffic
590
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 12 over Ann River is a wood or timber slab carrying Csah 12 over Ann River in Kanabec County, Minnesota. It was built in 1981, so it is 44 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 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 590 vehicles a day, projected to reach 531 by 2038. The structure is 124 ft (37.8 m) long and 38 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCsah 12
CrossesAnn River
Location1.4 MI SW of JCT Csah 6
RouteCounty Highway 12
CountyKanabec County
StateMinnesota
Coordinates45.87513, -93.36409
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.7 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadHS 20
Structure length124 ft (37.8 m)
Longest span32 ft (9.8 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic590 (2018)
Projected traffic531 by 2038
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 12 over Ann River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Csah 12 over Ann 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 November 2023.

How much traffic does Csah 12 over Ann River carry?

About 590 vehicles per day (2018 count).

How long is Csah 12 over Ann River?

The structure is 124 ft (37.8 m) long with a longest span of 32 ft (9.8 m) and a deck 38 ft wide.

Who owns Csah 12 over Ann River?

It is owned by the County Highway Agency.