US Bridges

Cb Cnty RD 680 over Encampment River

PoorPosted for load

Carbon County, Wyoming · 4 Miles N. of Encampment · Structure no. DMT

Built
1915
110 years old
Condition
Poor
inspected August 2024
Type
Truss - Thru
Steel
Length
183 ft
2 main spans
Daily traffic
71
2024 count
Owner
County
County Highway Agency

About this bridge

Cb Cnty RD 680 over Encampment River is a steel truss - thru carrying Cb Cnty RD 680 over Encampment River in Carbon County, Wyoming. It was built in 1915, so it is 110 years old, older than the Wyoming average of 48.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 71 vehicles a day, roughly 11% of them trucks, projected to reach 99 by 2043. The structure is 183 ft (55.8 m) long and 14 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesCb Cnty RD 680
CrossesEncampment River
Location4 Miles N. of Encampment
RouteCounty Highway 680
StateWyoming
Coordinates41.2655, -106.74423
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating14.4 US tons
Inventory rating5.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length183 ft (55.8 m)
Longest span90 ft (27.4 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deck12 ft (3.7 m)

Traffic and service

Average daily traffic71 (2024)
Projected traffic99 by 2043
Trucks11%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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$927,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Cb Cnty RD 680 over Encampment River built?

It was built in 1915, making it 110 years old in 2025.

What condition is Cb Cnty RD 680 over Encampment River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Cb Cnty RD 680 over Encampment River carry?

About 71 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Cb Cnty RD 680 over Encampment River?

The structure is 183 ft (55.8 m) long with a longest span of 90 ft (27.4 m) and a deck 14 ft wide.

Who owns Cb Cnty RD 680 over Encampment River?

It is owned by the County Highway Agency.