US Bridges

County Road 6 over Lake Grandby Buchanan C

Fair

Grand County, Colorado · East End of Lake Granby · Structure no. 049000609.0025A

Built
1993
32 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
126 ft
1 main span
Daily traffic
478
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 6 over Lake Grandby Buchanan C is a steel stringer/multi-beam or girder carrying County Road 6 over Lake Grandby Buchanan C in Grand County, Colorado. It was built in 1993, so it is 32 years old, younger 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 478 vehicles a day, roughly 9% of them trucks, projected to reach 564 by 2042. The structure is 126 ft (38.4 m) long and 34 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesCounty Road 6
CrossesLake Grandby Buchanan C
LocationEast End of Lake Granby
RouteCounty Highway 0
CountyGrand County
StateColorado
Coordinates40.11933, -105.7611
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span115 ft (35.1 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic478 (2023)
Projected traffic564 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 6 over Lake Grandby Buchanan C built?

It was built in 1993, making it 32 years old in 2025.

What condition is County Road 6 over Lake Grandby Buchanan C 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 September 2023.

How much traffic does County Road 6 over Lake Grandby Buchanan C carry?

About 478 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is County Road 6 over Lake Grandby Buchanan C?

The structure is 126 ft (38.4 m) long with a longest span of 115 ft (35.1 m) and a deck 34 ft wide.

Who owns County Road 6 over Lake Grandby Buchanan C?

It is owned by the County Highway Agency.