US Bridges

Csah 7 over Rock River

FairPosted for load

Rock County, Minnesota · 0.9 MI W of JCT Csah 2 · Structure no. 67503

Built
1969
56 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
144 ft
4 main spans
Daily traffic
729
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 7 over Rock River is a wood or timber stringer/multi-beam or girder carrying Csah 7 over Rock River in Rock County, Minnesota. It was built in 1969, so it is 56 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 729 vehicles a day, projected to reach 660 by 2042. The structure is 144 ft (43.9 m) long and 38 ft wide. If it were closed, the detour would be 23 mi (37 km).

Location

Open in Google Maps
CarriesCsah 7
CrossesRock River
Location0.9 MI W of JCT Csah 2
RouteCounty Highway 7
CountyRock County
StateMinnesota
Coordinates43.77557, -96.13026
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.7 US tons
Inventory rating25.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 20
Structure length144 ft (43.9 m)
Longest span36 ft (11 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic729 (2022)
Projected traffic660 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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 7 over Rock River built?

It was built in 1969, making it 56 years old in 2025.

What condition is Csah 7 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 7 over Rock River carry?

About 729 vehicles per day (2022 count).

How long is Csah 7 over Rock River?

The structure is 144 ft (43.9 m) long with a longest span of 36 ft (11 m) and a deck 38 ft wide.

Who owns Csah 7 over Rock River?

It is owned by the County Highway Agency.