US Bridges

Csah 1 over Shell Rock River

Fair

Freeborn County, Minnesota · 0.9 MI W of JCT TH 65 · Structure no. 24508

Built
1972
53 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
173 ft
3 main spans
Daily traffic
465
2017 count
Owner
County
County Highway Agency

About this bridge

Csah 1 over Shell Rock River is a prestressed concrete stringer/multi-beam or girder carrying Csah 1 over Shell Rock River in Freeborn County, Minnesota. It was built in 1972, so it is 53 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 465 vehicles a day, projected to reach 465 by 2039. The structure is 173 ft (52.6 m) long and 36 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesCsah 1
CrossesShell Rock River
Location0.9 MI W of JCT TH 65
RouteCounty Highway 1
CountyFreeborn County
StateMinnesota
Coordinates43.51392, -93.26862
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.6 US tons
Inventory rating38.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length173 ft (52.6 m)
Longest span58 ft (17.6 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic465 (2017)
Projected traffic465 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 1 over Shell Rock River built?

It was built in 1972, making it 53 years old in 2025.

What condition is Csah 1 over Shell Rock 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 2024.

How much traffic does Csah 1 over Shell Rock River carry?

About 465 vehicles per day (2017 count).

How long is Csah 1 over Shell Rock River?

The structure is 173 ft (52.6 m) long with a longest span of 58 ft (17.6 m) and a deck 36 ft wide.

Who owns Csah 1 over Shell Rock River?

It is owned by the County Highway Agency.