US Bridges

Csah 6 over ST Francis River

Fair

Benton County, Minnesota · 0.6 MI N of JCT Csah 4 · Structure no. 05511

Built
1971
54 years old
Condition
Fair
inspected November 2023
Type
Channel Beam
Prestressed Concrete
Length
63 ft
3 main spans
Daily traffic
550
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 6 over ST Francis River is a prestressed concrete channel beam carrying Csah 6 over ST Francis River in Benton County, Minnesota. It was built in 1971, so it is 54 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 5 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 550 vehicles a day, projected to reach 520 by 2039. The structure is 63 ft (19.3 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 6
CrossesST Francis River
Location0.6 MI N of JCT Csah 4
RouteCounty Highway 6
CountyBenton County
StateMinnesota
Coordinates45.67258, -93.86446
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.7 US tons
Inventory rating55.4 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length63 ft (19.3 m)
Longest span25 ft (7.7 m)
Deck width38 ft (11.6 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2019)
Projected traffic520 by 2039
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 Csah 6 over ST Francis River built?

It was built in 1971, making it 54 years old in 2025.

What condition is Csah 6 over ST Francis 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 2023.

How much traffic does Csah 6 over ST Francis River carry?

About 550 vehicles per day (2019 count).

How long is Csah 6 over ST Francis River?

The structure is 63 ft (19.3 m) long with a longest span of 25 ft (7.7 m) and a deck 38 ft wide.

Who owns Csah 6 over ST Francis River?

It is owned by the County Highway Agency.