US Bridges

Csah 12 over Little Rock Creek

PoorPosted for load

Benton County, Minnesota · 0.7 MI NE of JCT 10 · Structure no. 05507

Built
1967
58 years old
Condition
Poor
inspected October 2024
Type
Channel Beam
Prestressed Concrete
Length
75 ft
3 main spans
Daily traffic
1,100
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 12 over Little Rock Creek is a prestressed concrete channel beam carrying Csah 12 over Little Rock Creek in Benton County, Minnesota. It was built in 1967, so it is 58 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 3 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 1,100 vehicles a day, projected to reach 1,000 by 2039. The structure is 75 ft (22.9 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 12
CrossesLittle Rock Creek
Location0.7 MI NE of JCT 10
RouteCounty Highway 12
CountyBenton County
StateMinnesota
Coordinates45.76375, -94.20506
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.4 US tons
Inventory rating19.8 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadH 20
Structure length75 ft (22.9 m)
Longest span25 ft (7.7 m)
Deck width31 ft (9.6 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2019)
Projected traffic1,000 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Little Rock Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Csah 12 over Little Rock Creek 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 October 2024.

How much traffic does Csah 12 over Little Rock Creek carry?

About 1,100 vehicles per day (2019 count).

How long is Csah 12 over Little Rock Creek?

The structure is 75 ft (22.9 m) long with a longest span of 25 ft (7.7 m) and a deck 31 ft wide.

Who owns Csah 12 over Little Rock Creek?

It is owned by the County Highway Agency.