US Bridges

Csah 15 over ST Francis River

FairPosted for load

Sherburne County, Minnesota · 3.1 MI S of JCT Csah 4 · Structure no. 71509

Built
1972
53 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
138 ft
3 main spans
Daily traffic
3,350
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 15 over ST Francis River is a wood or timber stringer/multi-beam or girder carrying Csah 15 over ST Francis River in Sherburne 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. Its operating status is: posted for load restriction.

It carries about 3,350 vehicles a day, projected to reach 3,400 by 2038. The structure is 138 ft (42.1 m) long and 38 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesCsah 15
CrossesST Francis River
Location3.1 MI S of JCT Csah 4
RouteCounty Highway 15
Coordinates45.39939, -93.68521
Functional classRural Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.6 US tons
Inventory rating30.1 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length138 ft (42.1 m)
Longest span46 ft (14 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,350 (2018)
Projected traffic3,400 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 15 over ST Francis River built?

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

What condition is Csah 15 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 October 2024.

How much traffic does Csah 15 over ST Francis River carry?

About 3,350 vehicles per day (2018 count).

How long is Csah 15 over ST Francis River?

The structure is 138 ft (42.1 m) long with a longest span of 46 ft (14 m) and a deck 38 ft wide.

Who owns Csah 15 over ST Francis River?

It is owned by the County Highway Agency.