US Bridges

County Road 139 over Drainage Area

Fair

Morton County, North Dakota · 3 South 6 East of Hebron · Structure no. 000000030108091

Built
1965
60 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
470
2018 count
Owner
County
County Highway Agency

About this bridge

County Road 139 over Drainage Area is a concrete culvert carrying County Road 139 over Drainage Area in Morton County, North Dakota. It was built in 1965, so it is 60 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 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 470 vehicles a day, roughly 10% of them trucks, projected to reach 500 by 2038. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesCounty Road 139
CrossesDrainage Area
Location3 South 6 East of Hebron
RouteCounty Highway 3006
CountyMorton County
StateNorth Dakota
Coordinates46.86366, -101.93529
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic470 (2018)
Projected traffic500 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 139 over Drainage Area built?

It was built in 1965, making it 60 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 July 2023.

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

About 470 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is County Road 139 over Drainage Area?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns County Road 139 over Drainage Area?

It is owned by the County Highway Agency.