US Bridges

Csah 71 over Swan River

FairPosted for load

Itasca County, Minnesota · 0.6 MI S of JCT Csah 10 · Structure no. 31507

Built
1966
59 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
73 ft
3 main spans
Daily traffic
481
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 71 over Swan River is a wood or timber stringer/multi-beam or girder carrying Csah 71 over Swan River in Itasca County, Minnesota. It was built in 1966, so it is 59 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. Its operating status is: posted for load restriction.

It carries about 481 vehicles a day, projected to reach 415 by 2042. The structure is 73 ft (22.2 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCsah 71
CrossesSwan River
Location0.6 MI S of JCT Csah 10
RouteCounty Highway 71
CountyItasca County
StateMinnesota
Coordinates47.2229, -93.35246
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionNovember 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.4 US tons
Inventory rating24.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 20
Structure length73 ft (22.2 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic481 (2022)
Projected traffic415 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$950 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 71 over Swan River built?

It was built in 1966, making it 59 years old in 2025.

What condition is Csah 71 over Swan 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 71 over Swan River carry?

About 481 vehicles per day (2022 count).

How long is Csah 71 over Swan River?

The structure is 73 ft (22.2 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Csah 71 over Swan River?

It is owned by the County Highway Agency.