US Bridges

County Road 663 over Tonahutu Creek

Fair

Grand County, Colorado · South from Kawuneeche Vis · Structure no. 1520016P0000000

Built
1983
42 years old
Condition
Fair
inspected October 2024
Type
Culvert
Steel
Length
25 ft
2 main spans
Daily traffic
75
2019 count
Owner
Federal
National Park Service

About this bridge

County Road 663 over Tonahutu Creek is a steel culvert carrying County Road 663 over Tonahutu Creek in Grand County, Colorado. It was built in 1983, so it is 42 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 5 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 75 vehicles a day, roughly 1% of them trucks, projected to reach 150 by 2039. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesCounty Road 663
CrossesTonahutu Creek
LocationSouth from Kawuneeche Vis
RouteFederal Lands Road 0
CountyGrand County
StateColorado
Coordinates40.25659, -105.81551
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2019)
Projected traffic150 by 2039
Trucks1%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$90,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 663 over Tonahutu Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is County Road 663 over Tonahutu 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 October 2024.

How much traffic does County Road 663 over Tonahutu Creek carry?

About 75 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is County Road 663 over Tonahutu Creek?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns County Road 663 over Tonahutu Creek?

It is owned by the National Park Service.