US Bridges

County Road 18 over Rattlesnake Creek

Fair

Arapahoe County, Colorado · 2.9 Miles E of CR 181 · Structure no. ARA 18-47.9

Built
1968
57 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
59 ft
1 main span
Daily traffic
130
2021 count
Owner
County
County Highway Agency

About this bridge

County Road 18 over Rattlesnake Creek is a prestressed concrete tee beam carrying County Road 18 over Rattlesnake Creek in Arapahoe County, Colorado. It was built in 1968, so it is 57 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 130 vehicles a day, projected to reach 159 by 2041. The structure is 59 ft (18.1 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCounty Road 18
CrossesRattlesnake Creek
Location2.9 Miles E of CR 181
RouteCounty Highway 0
CountyArapahoe County
StateColorado
Coordinates39.68137, -104.15679
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length59 ft (18.1 m)
Longest span58 ft (17.7 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2021)
Projected traffic159 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 18 over Rattlesnake Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is County Road 18 over Rattlesnake 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 18 over Rattlesnake Creek carry?

About 130 vehicles per day (2021 count).

How long is County Road 18 over Rattlesnake Creek?

The structure is 59 ft (18.1 m) long with a longest span of 58 ft (17.7 m) and a deck 30 ft wide.

Who owns County Road 18 over Rattlesnake Creek?

It is owned by the County Highway Agency.