US Bridges

Csah 7 over Prairie River

FairPosted for load

Itasca County, Minnesota · 1.3 MI N of JCT Csah 60 · Structure no. 31520

Built
1980
45 years old
Condition
Fair
inspected November 2023
Type
Slab
Wood or Timber
Length
128 ft
4 main spans
Daily traffic
1,250
2017 count
Owner
County
County Highway Agency

About this bridge

Csah 7 over Prairie River is a wood or timber slab carrying Csah 7 over Prairie River in Itasca County, Minnesota. It was built in 1980, so it is 45 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 1,250 vehicles a day, projected to reach 1,250 by 2039. The structure is 128 ft (39 m) long and 47 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCsah 7
CrossesPrairie River
Location1.3 MI N of JCT Csah 60
RouteCounty Highway 7
CountyItasca County
StateMinnesota
Coordinates47.38886, -93.38262
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating32 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadHS 20
Structure length128 ft (39 m)
Longest span32 ft (9.8 m)
Deck width47 ft (14.2 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,250 (2017)
Projected traffic1,250 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Prairie River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Csah 7 over Prairie 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 7 over Prairie River carry?

About 1,250 vehicles per day (2017 count).

How long is Csah 7 over Prairie River?

The structure is 128 ft (39 m) long with a longest span of 32 ft (9.8 m) and a deck 47 ft wide.

Who owns Csah 7 over Prairie River?

It is owned by the County Highway Agency.