US Bridges

County Road 86 over Big Muddy Creek

Good

Morton County, North Dakota · City of Almont · Structure no. 000000030128180

Built
2019
6 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
171 ft
3 main spans
Daily traffic
350
2019 count
Owner
County
County Highway Agency

About this bridge

County Road 86 over Big Muddy Creek is a prestressed concrete box beam or girders - single or spread carrying County Road 86 over Big Muddy Creek in Morton County, North Dakota. It was built in 2019, so it is 6 years old, younger than the North Dakota average of 48.2 years.

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

It carries about 350 vehicles a day, roughly 10% of them trucks, projected to reach 400 by 2039. The structure is 171 ft (52.1 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Road 86
CrossesBig Muddy Creek
LocationCity of Almont
RouteCounty Highway 3027
CountyMorton County
StateNorth Dakota
Coordinates46.72336, -101.50974
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating30.6 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length171 ft (52.1 m)
Longest span63 ft (19.3 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2019)
Projected traffic400 by 2039
Trucks10%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$327,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 86 over Big Muddy Creek built?

It was built in 2019, making it 6 years old in 2025.

What condition is County Road 86 over Big Muddy Creek 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 July 2023.

How much traffic does County Road 86 over Big Muddy Creek carry?

About 350 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is County Road 86 over Big Muddy Creek?

The structure is 171 ft (52.1 m) long with a longest span of 63 ft (19.3 m) and a deck 34 ft wide.

Who owns County Road 86 over Big Muddy Creek?

It is owned by the County Highway Agency.