US Bridges

Co. St. Aid HWY 13 over Chippewa River

Fair

Chippewa County, Minnesota · 1 Miles NE of Watson Mn · Structure no. 000000000006389

Built
1938
87 years old, rebuilt 1986
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
151 ft
5 main spans
Daily traffic
520
2022 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Co. St. Aid HWY 13 over Chippewa River is a prestressed concrete stringer/multi-beam or girder carrying Co. St. Aid HWY 13 over Chippewa River in Chippewa County, Minnesota. It was built in 1938 and reconstructed in 1986, so it is 87 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 520 vehicles a day, roughly 13% of them trucks, projected to reach 558 by 2042. The structure is 151 ft (46 m) long and 39 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesCo. St. Aid HWY 13
CrossesChippewa River
Location1 Miles NE of Watson Mn
RouteCounty Highway 13
Coordinates45.022, -95.7912
Functional classRural Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating27.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length151 ft (46 m)
Longest span30 ft (9.1 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic520 (2022)
Projected traffic558 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$380,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Co. St. Aid HWY 13 over Chippewa River built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1986.

What condition is Co. St. Aid HWY 13 over Chippewa 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 August 2024.

How much traffic does Co. St. Aid HWY 13 over Chippewa River carry?

About 520 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Co. St. Aid HWY 13 over Chippewa River?

The structure is 151 ft (46 m) long with a longest span of 30 ft (9.1 m) and a deck 39 ft wide.

Who owns Co. St. Aid HWY 13 over Chippewa River?

It is owned by the Corps of Engineers (Civil) and maintained by the County Highway Agency.