US Bridges

Csah 1 over Otter Tail River

Fair

Otter Tail County, Minnesota · 1.1 MI W of JCT TH 78 · Structure no. 56528

Built
1987
38 years old
Condition
Fair
inspected October 2024
Type
Slab
Wood or Timber
Length
78 ft
3 main spans
Daily traffic
1,750
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 1 over Otter Tail River is a wood or timber slab carrying Csah 1 over Otter Tail River in Otter Tail County, Minnesota. It was built in 1987, so it is 38 years old, younger 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 1,750 vehicles a day, projected to reach 1,850 by 2039. The structure is 78 ft (23.8 m) long and 42 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesCsah 1
CrossesOtter Tail River
Location1.1 MI W of JCT TH 78
RouteCounty Highway 1
Coordinates46.44313, -95.59942
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.
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating46.3 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span26 ft (7.9 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,750 (2019)
Projected traffic1,850 by 2039
Trucks—
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$269 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 1 over Otter Tail River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Csah 1 over Otter Tail 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 October 2024.

How much traffic does Csah 1 over Otter Tail River carry?

About 1,750 vehicles per day (2019 count).

How long is Csah 1 over Otter Tail River?

The structure is 78 ft (23.8 m) long with a longest span of 26 ft (7.9 m) and a deck 42 ft wide.

Who owns Csah 1 over Otter Tail River?

It is owned by the County Highway Agency.