US Bridges

County Road 73 over St. Louis Creek

Fair

Grand County, Colorado · 0.9 MI West of US HWY 40 · Structure no. 049007300.9016A

Built
1981
44 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
25 ft
1 main span
Daily traffic
817
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 73 over St. Louis Creek is a wood or timber stringer/multi-beam or girder carrying County Road 73 over St. Louis Creek in Grand County, Colorado. It was built in 1981, so it is 44 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.

It carries about 817 vehicles a day, roughly 14% of them trucks, projected to reach 964 by 2042. The structure is 25 ft (7.5 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesCounty Road 73
CrossesSt. Louis Creek
Location0.9 MI West of US HWY 40
RouteCounty Highway 0
CountyGrand County
StateColorado
Coordinates39.94459, -105.83013
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating56.5 US tons
Inventory rating39.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length25 ft (7.5 m)
Longest span22 ft (6.7 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic817 (2023)
Projected traffic964 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 73 over St. Louis Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is County Road 73 over St. Louis 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 September 2023.

How much traffic does County Road 73 over St. Louis Creek carry?

About 817 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is County Road 73 over St. Louis Creek?

The structure is 25 ft (7.5 m) long with a longest span of 22 ft (6.7 m) and a deck 26 ft wide.

Who owns County Road 73 over St. Louis Creek?

It is owned by the County Highway Agency.