US Bridges

County Road 28 over Louden Ditch

Fair

Larimer County, Colorado · 0.5 MI E of CO RD 17 · Structure no. LR28-0.5-17

Built
1977
48 years old
Condition
Fair
inspected March 2025
Type
Tee Beam
Prestressed Concrete
Length
27 ft
1 main span
Daily traffic
11,797
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 28 over Louden Ditch is a prestressed concrete tee beam carrying County Road 28 over Louden Ditch in Larimer County, Colorado. It was built in 1977, so it is 48 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 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 11,797 vehicles a day, roughly 17% of them trucks, projected to reach 14,746 by 2043. The structure is 27 ft (8.1 m) long and 60 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Road 28
CrossesLouden Ditch
Location0.5 MI E of CO RD 17
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.45106, -105.08719
Functional classUrban Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.7 US tons
Inventory rating47.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.1 m)
Longest span22 ft (6.8 m)
Deck width60 ft (18.2 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,797 (2023)
Projected traffic14,746 by 2043
Trucks17%
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Road 28 over Louden Ditch built?

It was built in 1977, making it 48 years old in 2025.

What condition is County Road 28 over Louden Ditch 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 March 2025.

How much traffic does County Road 28 over Louden Ditch carry?

About 11,797 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is County Road 28 over Louden Ditch?

The structure is 27 ft (8.1 m) long with a longest span of 22 ft (6.8 m) and a deck 60 ft wide.

Who owns County Road 28 over Louden Ditch?

It is owned by the County Highway Agency.