US Bridges

County Road 56.3 over Harmony NO2 Return Canal

Poor

Logan County, Colorado · 0.4 MI W of CO RD 77 · Structure no. LOG56.3-75.6160

Built
1930
95 years old
Condition
Poor
inspected December 2023
Type
Tee Beam
Concrete
Length
66 ft
2 main spans
Daily traffic
—
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 56.3 over Harmony NO2 Return Canal is a concrete tee beam carrying County Road 56.3 over Harmony NO2 Return Canal in Logan County, Colorado. It was built in 1930, so it is 95 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

No traffic count is recorded. The structure is 66 ft (20 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCounty Road 56.3
CrossesHarmony NO2 Return Canal
Location0.4 MI W of CO RD 77
RouteCounty Highway 0
Coordinates40.84013, -102.85627
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length66 ft (20 m)
Longest span30 ft (9.1 m)
Deck width22 ft (6.7 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic—
Trucks50%
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Road 56.3 over Harmony NO2 Return Canal built?

It was built in 1930, making it 95 years old in 2025.

What condition is County Road 56.3 over Harmony NO2 Return Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2023.

How much traffic does County Road 56.3 over Harmony NO2 Return Canal carry?

No traffic count is recorded for this structure.

How long is County Road 56.3 over Harmony NO2 Return Canal?

The structure is 66 ft (20 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.

Who owns County Road 56.3 over Harmony NO2 Return Canal?

It is owned by the County Highway Agency.