US Bridges

County Road 30 over Louden Ditch

Fair

Larimer County, Colorado · 0.2 MI E of US HWY 287 · Structure no. LR30-0.2-S287

Built
1979
46 years old
Condition
Fair
inspected March 2025
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
20 ft
1 main span
Daily traffic
1,036
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 30 over Louden Ditch is a aluminum, wrought iron, or cast iron culvert carrying County Road 30 over Louden Ditch in Larimer County, Colorado. It was built in 1979, so it is 46 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 1,036 vehicles a day, roughly 28% of them trucks, projected to reach 1,295 by 2043. The structure is 20 ft (6.1 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 30
CrossesLouden Ditch
Location0.2 MI E of US HWY 287
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.46564, -105.07375
Functional classUrban 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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans1
Design loadHS 20
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width68 ft (20.7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,036 (2023)
Projected traffic1,295 by 2043
Trucks28%
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Road 30 over Louden Ditch built?

It was built in 1979, making it 46 years old in 2025.

What condition is County Road 30 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 30 over Louden Ditch carry?

About 1,036 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is County Road 30 over Louden Ditch?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 68 ft wide.

Who owns County Road 30 over Louden Ditch?

It is owned by the County Highway Agency.