US Bridges

County Road 81 over Harmony No. 1 Canal

Fair

Logan County, Colorado · 1.9 MI N of US HWY 138 · Structure no. LOG81-62.3-217A

Built
1995
30 years old
Condition
Fair
inspected January 2024
Type
Tee Beam
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
154
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 81 over Harmony No. 1 Canal is a prestressed concrete tee beam carrying County Road 81 over Harmony No. 1 Canal in Logan County, Colorado. It was built in 1995, so it is 30 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 154 vehicles a day, roughly 37% of them trucks, projected to reach 189 by 2042. The structure is 50 ft (15.2 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Road 81
CrossesHarmony No. 1 Canal
Location1.9 MI N of US HWY 138
RouteCounty Highway 0
CountyLogan County
StateColorado
Coordinates40.885, -102.80555
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.2 US tons
Inventory rating36.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span45 ft (13.7 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic154 (2023)
Projected traffic189 by 2042
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 81 over Harmony No. 1 Canal built?

It was built in 1995, making it 30 years old in 2025.

What condition is County Road 81 over Harmony No. 1 Canal 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 January 2024.

How much traffic does County Road 81 over Harmony No. 1 Canal carry?

About 154 vehicles per day (2023 count), of which roughly 37% are trucks.

How long is County Road 81 over Harmony No. 1 Canal?

The structure is 50 ft (15.2 m) long with a longest span of 45 ft (13.7 m) and a deck 35 ft wide.

Who owns County Road 81 over Harmony No. 1 Canal?

It is owned by the County Highway Agency.