US Bridges

Mn 84 over Ada Brook

Fair

Cass County, Minnesota · 7.3 MI N of Pine River · Structure no. 11X05

Built
2015
10 years old
Condition
Fair
inspected October 2021
Type
Culvert
Concrete
Length
35 ft
2 main spans
Daily traffic
1,341
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 84 over Ada Brook is a concrete culvert carrying Mn 84 over Ada Brook in Cass County, Minnesota. It was built in 2015, so it is 10 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 1,341 vehicles a day, roughly 8% of them trucks, projected to reach 1,400 by 2042. The structure is 35 ft (10.8 m) long. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesMn 84
CrossesAda Brook
Location7.3 MI N of Pine River
RouteState Highway 84
CountyCass County
StateMinnesota
Coordinates46.79662, -94.36452
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length35 ft (10.8 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,341 (2022)
Projected traffic1,400 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Mn 84 over Ada Brook built?

It was built in 2015, making it 10 years old in 2025.

What condition is Mn 84 over Ada Brook 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 2021.

How much traffic does Mn 84 over Ada Brook carry?

About 1,341 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Mn 84 over Ada Brook?

The structure is 35 ft (10.8 m) long with a longest span of 16 ft (4.9 m).

Who owns Mn 84 over Ada Brook?

It is owned by the State Highway Agency.