US Bridges

Csah 28 over Ripple River

Fair

Aitkin County, Minnesota · 1.4 MI E of JCT TH 169 · Structure no. 01512

Built
1978
47 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
1,050
2020 count
Owner
County
County Highway Agency

About this bridge

Csah 28 over Ripple River is a prestressed concrete tee beam carrying Csah 28 over Ripple River in Aitkin County, Minnesota. It was built in 1978, so it is 47 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 1,050 vehicles a day, projected to reach 830 by 2040. The structure is 46 ft (14 m) long and 37 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesCsah 28
CrossesRipple River
Location1.4 MI E of JCT TH 169
RouteCounty Highway 28
CountyAitkin County
StateMinnesota
Coordinates46.43209, -93.71472
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.6 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span46 ft (14 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (2020)
Projected traffic830 by 2040
Trucks—
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

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 28 over Ripple River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Csah 28 over Ripple 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 28 over Ripple River carry?

About 1,050 vehicles per day (2020 count).

How long is Csah 28 over Ripple River?

The structure is 46 ft (14 m) long with a longest span of 46 ft (14 m) and a deck 37 ft wide.

Who owns Csah 28 over Ripple River?

It is owned by the County Highway Agency.