US Bridges

County Road 30 over Senac Creek

Fair

Arapahoe County, Colorado · 2.5 Miles E of SH 30 · Structure no. ARA 30-20.5

Built
1958
67 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
20 ft
1 main span
Daily traffic
3,573
2021 count
Owner
County
County Highway Agency

About this bridge

County Road 30 over Senac Creek is a concrete culvert carrying County Road 30 over Senac Creek in Arapahoe County, Colorado. It was built in 1958, so it is 67 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 3,573 vehicles a day, roughly 5% of them trucks, projected to reach 4,359 by 2041. The structure is 20 ft (6.1 m) long and 54 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesCounty Road 30
CrossesSenac Creek
Location2.5 Miles E of SH 30
RouteCounty Highway 0
CountyArapahoe County
StateColorado
Coordinates39.63831, -104.67149
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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width54 ft (16.6 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,573 (2021)
Projected traffic4,359 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 30 over Senac Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is County Road 30 over Senac Creek 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 November 2023.

How much traffic does County Road 30 over Senac Creek carry?

About 3,573 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is County Road 30 over Senac Creek?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 54 ft wide.

Who owns County Road 30 over Senac Creek?

It is owned by the County Highway Agency.