US Bridges

Csah 9 over Mississippi River (dam)

Fair

Itasca County, Minnesota · 2.0 MI W of JCT TH 46 · Structure no. 5358

Built
1918
107 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
169 ft
6 main spans
Daily traffic
930
2020 count
Owner
County
County Highway Agency

About this bridge

Csah 9 over Mississippi River (dam) is a concrete continuous slab carrying Csah 9 over Mississippi River (dam) in Itasca County, Minnesota. It was built in 1918, so it is 107 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.

It carries about 930 vehicles a day, projected to reach 740 by 2040. The structure is 169 ft (51.5 m) long and 46 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesCsah 9
CrossesMississippi River (dam)
Location2.0 MI W of JCT TH 46
RouteCounty Highway 9
CountyItasca County
StateMinnesota
Coordinates47.4296, -94.05115
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.6 US tons
Inventory rating45.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length169 ft (51.5 m)
Longest span28 ft (8.5 m)
Deck width46 ft (14 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic930 (2020)
Projected traffic740 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed21.1 mi (34 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 9 over Mississippi River (dam) built?

It was built in 1918, making it 107 years old in 2025.

What condition is Csah 9 over Mississippi River (dam) 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 May 2023.

How much traffic does Csah 9 over Mississippi River (dam) carry?

About 930 vehicles per day (2020 count).

How long is Csah 9 over Mississippi River (dam)?

The structure is 169 ft (51.5 m) long with a longest span of 28 ft (8.5 m) and a deck 46 ft wide.

Who owns Csah 9 over Mississippi River (dam)?

It is owned by the County Highway Agency.