US Bridges

Csah 5 over Rum River

Fair

Isanti County, Minnesota · 0.4 MI W of JCT Csah 23 · Structure no. 30507

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
326 ft
3 main spans
Daily traffic
8,522
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 5 over Rum River is a prestressed concrete stringer/multi-beam or girder carrying Csah 5 over Rum River in Isanti County, Minnesota. It was built in 1978, so it is 47 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 8,522 vehicles a day, roughly 8% of them trucks, projected to reach 7,500 by 2042. The structure is 326 ft (99.4 m) long and 56 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesCsah 5
CrossesRum River
Location0.4 MI W of JCT Csah 23
RouteCounty Highway 5
CountyIsanti County
StateMinnesota
Coordinates45.4931, -93.26569
Functional classUrban 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.4 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length326 ft (99.4 m)
Longest span107 ft (32.6 m)
Deck width56 ft (17.2 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,522 (2022)
Projected traffic7,500 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed14.3 mi (23 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 5 over Rum River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Csah 5 over Rum 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 September 2023.

How much traffic does Csah 5 over Rum River carry?

About 8,522 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Csah 5 over Rum River?

The structure is 326 ft (99.4 m) long with a longest span of 107 ft (32.6 m) and a deck 56 ft wide.

Who owns Csah 5 over Rum River?

It is owned by the County Highway Agency.