US Bridges

County Road 64A over Elk River

Fair

Routt County, Colorado · 0.3 MI S of CO RD 64 · Structure no. 107064A00.20924

Built
1980
45 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
65 ft
2 main spans
Daily traffic
86
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 64A over Elk River is a wood or timber stringer/multi-beam or girder carrying County Road 64A over Elk River in Routt County, Colorado. It was built in 1980, so it is 45 years old, older than the Colorado average of 42.2 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 86 vehicles a day, roughly 16% of them trucks, projected to reach 102 by 2042. The structure is 65 ft (19.8 m) long and 17 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesCounty Road 64A
CrossesElk River
Location0.3 MI S of CO RD 64
RouteCounty Highway 0
CountyRoutt County
StateColorado
Coordinates40.75156, -106.82539
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.4 US tons
Inventory rating29.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
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 traffic86 (2023)
Projected traffic102 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$100,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 64A over Elk River built?

It was built in 1980, making it 45 years old in 2025.

What condition is County Road 64A over Elk River 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 October 2024.

How much traffic does County Road 64A over Elk River carry?

About 86 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is County Road 64A over 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 County Road 64A over Elk River?

It is owned by the County Highway Agency.