US Bridges

Mn 29 over Long Prairie River

Good

Douglas County, Minnesota · 7.7 MI N of JCT TH 27 · Structure no. 95108

Built
1989
36 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
6,481
2021 count
Owner
State
State Highway Agency

About this bridge

Mn 29 over Long Prairie River is a concrete culvert carrying Mn 29 over Long Prairie River in Douglas County, Minnesota. It was built in 1989, so it is 36 years old, younger than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,481 vehicles a day, roughly 12% of them trucks, projected to reach 7,000 by 2041. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMn 29
CrossesLong Prairie River
Location7.7 MI N of JCT TH 27
RouteState Highway 29
Coordinates45.9816, -95.31262
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating32.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,481 (2021)
Projected traffic7,000 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 29 over Long Prairie River built?

It was built in 1989, making it 36 years old in 2025.

What condition is Mn 29 over Long Prairie River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Mn 29 over Long Prairie River carry?

About 6,481 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is Mn 29 over Long Prairie River?

The structure is 28 ft (8.5 m) long with a longest span of 11 ft (3.3 m).

Who owns Mn 29 over Long Prairie River?

It is owned by the State Highway Agency.