US Bridges

Csah 1 over Rock River

FairPosted for load

Rock County, Minnesota · 0.3 MI W of JCT Csah 9 · Structure no. 67502

Built
1968
57 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
127 ft
3 main spans
Daily traffic
466
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 1 over Rock River is a wood or timber stringer/multi-beam or girder carrying Csah 1 over Rock River in Rock County, Minnesota. It was built in 1968, so it is 57 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. Its operating status is: posted for load restriction.

It carries about 466 vehicles a day, projected to reach 420 by 2042. The structure is 127 ft (38.6 m) long and 31 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesCsah 1
CrossesRock River
Location0.3 MI W of JCT Csah 9
RouteCounty Highway 1
CountyRock County
StateMinnesota
Coordinates43.54369, -96.17847
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.1 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 20
Structure length127 ft (38.6 m)
Longest span42 ft (12.8 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic466 (2022)
Projected traffic420 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Rock River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Csah 1 over 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 October 2023.

How much traffic does Csah 1 over Rock River carry?

About 466 vehicles per day (2022 count).

How long is Csah 1 over Rock River?

The structure is 127 ft (38.6 m) long with a longest span of 42 ft (12.8 m) and a deck 31 ft wide.

Who owns Csah 1 over Rock River?

It is owned by the County Highway Agency.