US Bridges

County Road 139 over Drainage Area

FairPosted for load

Morton County, North Dakota · 1 West of Glen Ullin · Structure no. 000000030112121

Built
1955
70 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
450
2018 count
Owner
County
County Highway Agency

About this bridge

County Road 139 over Drainage Area is a concrete slab carrying County Road 139 over Drainage Area in Morton County, North Dakota. It was built in 1955, so it is 70 years old, older than the North Dakota average of 48.2 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. Its operating status is: posted for load restriction.

It carries about 450 vehicles a day, roughly 10% of them trucks, projected to reach 500 by 2038. The structure is 24 ft (7.3 m) long and 35 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road 139
CrossesDrainage Area
Location1 West of Glen Ullin
RouteCounty Highway 3006
CountyMorton County
StateNorth Dakota
Coordinates46.81493, -101.85246
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24 US tons
Inventory rating14.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width35 ft (10.6 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2018)
Projected traffic500 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$32,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 139 over Drainage Area built?

It was built in 1955, making it 70 years old in 2025.

What condition is County Road 139 over Drainage Area 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 September 2023.

How much traffic does County Road 139 over Drainage Area carry?

About 450 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is County Road 139 over Drainage Area?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 35 ft wide.

Who owns County Road 139 over Drainage Area?

It is owned by the County Highway Agency.