US Bridges

County Road 55 over Larson Draw

Fair

Logan County, Colorado · 0.4 MI N of US HWY 138 · Structure no. LOG55-46.5-253

Built
1987
38 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
85
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 55 over Larson Draw is a steel stringer/multi-beam or girder carrying County Road 55 over Larson Draw in Logan County, Colorado. It was built in 1987, so it is 38 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 85 vehicles a day, roughly 49% of them trucks, projected to reach 105 by 2042. The structure is 25 ft (7.5 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road 55
CrossesLarson Draw
Location0.4 MI N of US HWY 138
RouteCounty Highway 0
CountyLogan County
StateColorado
Coordinates40.76791, -103.056
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length25 ft (7.5 m)
Longest span22 ft (6.8 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85 (2022)
Projected traffic105 by 2042
Trucks49%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 55 over Larson Draw built?

It was built in 1987, making it 38 years old in 2025.

What condition is County Road 55 over Larson Draw 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 December 2023.

How much traffic does County Road 55 over Larson Draw carry?

About 85 vehicles per day (2022 count), of which roughly 49% are trucks.

How long is County Road 55 over Larson Draw?

The structure is 25 ft (7.5 m) long with a longest span of 22 ft (6.8 m) and a deck 31 ft wide.

Who owns County Road 55 over Larson Draw?

It is owned by the County Highway Agency.