US Bridges

Csah 7 over Rum River

Fair

Isanti County, Minnesota · 0.3 MI N of JCT CR 40 · Structure no. 30501

Built
1968
57 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
264 ft
3 main spans
Daily traffic
583
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 7 over Rum River is a steel continuous stringer/multi-beam or girder carrying Csah 7 over Rum River in Isanti County, Minnesota. It was built in 1968, so it is 57 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 583 vehicles a day, roughly 8% of them trucks, projected to reach 520 by 2042. The structure is 264 ft (80.5 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesCsah 7
CrossesRum River
Location0.3 MI N of JCT CR 40
RouteCounty Highway 7
CountyIsanti County
StateMinnesota
Coordinates45.52939, -93.43911
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
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 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; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating50 US tons
Inventory rating29.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length264 ft (80.5 m)
Longest span100 ft (30.5 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic583 (2022)
Projected traffic520 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Rum River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Csah 7 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 7 over Rum River carry?

About 583 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Csah 7 over Rum River?

The structure is 264 ft (80.5 m) long with a longest span of 100 ft (30.5 m) and a deck 34 ft wide.

Who owns Csah 7 over Rum River?

It is owned by the County Highway Agency.