US Bridges

US 138 Ml over Harmony Ditch No 2

Fair

Logan County, Colorado · 14.7 MI NE of JCT SH 113 · Structure no. A-25-AV

Built
1993
32 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
43 ft
2 main spans
Daily traffic
450
2020 count
Owner
State
State Highway Agency

About this bridge

US 138 Ml over Harmony Ditch No 2 is a concrete culvert carrying US 138 Ml over Harmony Ditch No 2 in Logan County, Colorado. It was built in 1993, so it is 32 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 450 vehicles a day, roughly 15% of them trucks, projected to reach 495 by 2040. The structure is 43 ft (13.1 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS 138 Ml
CrossesHarmony Ditch No 2
Location14.7 MI NE of JCT SH 113
RouteU.S. Route 138A
CountyLogan County
StateColorado
Coordinates40.8369, -102.86697
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
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2025
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating81.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span20 ft (6 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2020)
Projected traffic495 by 2040
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 138 Ml over Harmony Ditch No 2 built?

It was built in 1993, making it 32 years old in 2025.

What condition is US 138 Ml over Harmony Ditch No 2 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 February 2025.

How much traffic does US 138 Ml over Harmony Ditch No 2 carry?

About 450 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is US 138 Ml over Harmony Ditch No 2?

The structure is 43 ft (13.1 m) long with a longest span of 20 ft (6 m) and a deck 36 ft wide.

Who owns US 138 Ml over Harmony Ditch No 2?

It is owned by the State Highway Agency.