US Bridges

Csah 12 over Groundhouse River

PoorPosted for load

Kanabec County, Minnesota · 0.4 MI S of JCT Csah 2 · Structure no. 33514

Built
1971
54 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
127 ft
3 main spans
Daily traffic
380
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 12 over Groundhouse River is a wood or timber stringer/multi-beam or girder carrying Csah 12 over Groundhouse River in Kanabec County, Minnesota. It was built in 1971, so it is 54 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 380 vehicles a day, projected to reach 355 by 2038. The structure is 127 ft (38.6 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCsah 12
CrossesGroundhouse River
Location0.4 MI S of JCT Csah 2
RouteCounty Highway 12
Coordinates45.78966, -93.36891
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40.3 US tons
Inventory rating25.9 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length127 ft (38.6 m)
Longest span42 ft (12.8 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic380 (2018)
Projected traffic355 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Groundhouse River built?

It was built in 1971, making it 54 years old in 2025.

What condition is Csah 12 over Groundhouse 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 November 2024.

How much traffic does Csah 12 over Groundhouse River carry?

About 380 vehicles per day (2018 count).

How long is Csah 12 over Groundhouse River?

The structure is 127 ft (38.6 m) long with a longest span of 42 ft (12.8 m) and a deck 34 ft wide.

Who owns Csah 12 over Groundhouse River?

It is owned by the County Highway Agency.