US Bridges

Csah 64 over Grand Marais State Ditch

Fair

Polk County, Minnesota · 1.9 MI S of JCT Csah 22 · Structure no. 60519

Built
1974
51 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
145 ft
3 main spans
Daily traffic
43
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 64 over Grand Marais State Ditch is a prestressed concrete stringer/multi-beam or girder carrying Csah 64 over Grand Marais State Ditch in Polk County, Minnesota. It was built in 1974, so it is 51 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 43 vehicles a day, projected to reach 35 by 2041. The structure is 145 ft (44.1 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCsah 64
CrossesGrand Marais State Ditch
Location1.9 MI S of JCT Csah 22
RouteCounty Highway 64
Coordinates48.04998, -97.06251
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating24.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length145 ft (44.1 m)
Longest span48 ft (14.7 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43 (2021)
Projected traffic35 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 64 over Grand Marais State Ditch built?

It was built in 1974, making it 51 years old in 2025.

What condition is Csah 64 over Grand Marais State Ditch 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 October 2024.

How much traffic does Csah 64 over Grand Marais State Ditch carry?

About 43 vehicles per day (2021 count).

How long is Csah 64 over Grand Marais State Ditch?

The structure is 145 ft (44.1 m) long with a longest span of 48 ft (14.7 m) and a deck 36 ft wide.

Who owns Csah 64 over Grand Marais State Ditch?

It is owned by the County Highway Agency.