US Bridges

County Road 123 over Six Mile Creek

FairPosted for load

Fremont County, Colorado · 4 MI E of Mackenzie Ave · Structure no. FRCO 123-107

Built
1960
65 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
61 ft
1 main span
Daily traffic
873
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 123 over Six Mile Creek is a steel stringer/multi-beam or girder carrying County Road 123 over Six Mile Creek in Fremont County, Colorado. It was built in 1960, so it is 65 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 873 vehicles a day, roughly 2% of them trucks, projected to reach 978 by 2042. The structure is 61 ft (18.6 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCounty Road 123
CrossesSix Mile Creek
Location4 MI E of Mackenzie Ave
RouteCounty Highway 0
Coordinates38.46122, -105.12536
Functional classUrban 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
Deck9 ExcellentNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating27.8 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20 + Mod
Structure length61 ft (18.6 m)
Longest span57 ft (17.4 m)
Deck width25 ft (7.7 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic873 (2022)
Projected traffic978 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$2 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 123 over Six Mile Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is County Road 123 over Six Mile Creek 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 January 2025.

How much traffic does County Road 123 over Six Mile Creek carry?

About 873 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road 123 over Six Mile Creek?

The structure is 61 ft (18.6 m) long with a longest span of 57 ft (17.4 m) and a deck 25 ft wide.

Who owns County Road 123 over Six Mile Creek?

It is owned by the County Highway Agency.