US Bridges

Csah 10 over Perch Creek

PoorPosted for load

Blue Earth County, Minnesota · 0.7 MI S of JCT CO R 135 · Structure no. 90515

Built
1955
70 years old
Condition
Poor
inspected October 2024
Type
Channel Beam
Prestressed Concrete
Length
50 ft
2 main spans
Daily traffic
125
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 10 over Perch Creek is a prestressed concrete channel beam carrying Csah 10 over Perch Creek in Blue Earth County, Minnesota. It was built in 1955, so it is 70 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 125 vehicles a day, projected to reach 110 by 2041. The structure is 50 ft (15.2 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCsah 10
CrossesPerch Creek
Location0.7 MI S of JCT CO R 135
RouteCounty Highway 10
Coordinates43.97429, -94.33918
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length50 ft (15.2 m)
Longest span24 ft (7.3 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2021)
Projected traffic110 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$247 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 10 over Perch Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is Csah 10 over Perch 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 10 over Perch Creek carry?

About 125 vehicles per day (2021 count).

How long is Csah 10 over Perch Creek?

The structure is 50 ft (15.2 m) long with a longest span of 24 ft (7.3 m) and a deck 27 ft wide.

Who owns Csah 10 over Perch Creek?

It is owned by the County Highway Agency.