US Bridges

CR 156 over Maple River

PoorPosted for load

Blue Earth County, Minnesota · 0.1 MI S of JCT CR 154 · Structure no. 90555

Built
1961
64 years old
Condition
Poor
inspected November 2024
Type
Channel Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
141
2021 count
Owner
County
County Highway Agency

About this bridge

CR 156 over Maple River is a prestressed concrete channel beam carrying CR 156 over Maple River in Blue Earth County, Minnesota. It was built in 1961, so it is 64 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 141 vehicles a day, projected to reach 60 by 2041. The structure is 31 ft (9.4 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCR 156
CrossesMaple River
Location0.1 MI S of JCT CR 154
RouteCounty Highway 156
Coordinates43.87108, -93.89826
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating9.7 US tons
Inventory rating4.3 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.9 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic141 (2021)
Projected traffic60 by 2041
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 CR 156 over Maple River built?

It was built in 1961, making it 64 years old in 2025.

What condition is CR 156 over Maple 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 CR 156 over Maple River carry?

About 141 vehicles per day (2021 count).

How long is CR 156 over Maple River?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.9 m) and a deck 27 ft wide.

Who owns CR 156 over Maple River?

It is owned by the County Highway Agency.