US Bridges

NFSR 400.1 over North Fork Elk River

Good

Routt County, Colorado · 8 Miles East of Clark CO · Structure no. 020603000024136

Built
1956
69 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
2 main spans
Daily traffic
106
2012 count
Owner
Federal
U.S. Forest Service

About this bridge

NFSR 400.1 over North Fork Elk River is a steel stringer/multi-beam or girder carrying NFSR 400.1 over North Fork Elk River in Routt County, Colorado. It was built in 1956, so it is 69 years old, older than the Colorado average of 42.2 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 106 vehicles a day, roughly 10% of them trucks, projected to reach 159 by 2045. The structure is 65 ft (19.8 m) long and 17 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesNFSR 400.1
CrossesNorth Fork Elk River
Location8 Miles East of Clark CO
RouteFederal Lands Road 400.1
Coordinates40.77181, -106.77368
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans2
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span29 ft (8.9 m)
Deck width17 ft (5.3 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic106 (2012)
Projected traffic159 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NFSR 400.1 over North Fork Elk River built?

It was built in 1956, making it 69 years old in 2025.

What condition is NFSR 400.1 over North Fork Elk 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 2023.

How much traffic does NFSR 400.1 over North Fork Elk River carry?

About 106 vehicles per day (2012 count), of which roughly 10% are trucks.

How long is NFSR 400.1 over North Fork Elk River?

The structure is 65 ft (19.8 m) long with a longest span of 29 ft (8.9 m) and a deck 17 ft wide.

Who owns NFSR 400.1 over North Fork Elk River?

It is owned by the U.S. Forest Service.