US Bridges

61st Avenue over Ralston Creek

Fair

Jefferson County, Colorado · 0.17 MI E of Ralston Road · Structure no. ARVA-61-0.17-01

Built
1957
68 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
184
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

61st Avenue over Ralston Creek is a concrete culvert carrying 61st Avenue over Ralston Creek in Jefferson County, Colorado. It was built in 1957, so it is 68 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 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 184 vehicles a day, roughly 2% of them trucks, projected to reach 212 by 2041. The structure is 28 ft (8.5 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries61st Avenue
CrossesRalston Creek
Location0.17 MI E of Ralston Road
RouteCity Street 0
CountyJefferson County
StateColorado
Coordinates39.80798, -105.1064
Functional classUrban 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
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span13 ft (4.1 m)
Deck width44 ft (13.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic184 (2021)
Projected traffic212 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 61st Avenue over Ralston Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is 61st Avenue over Ralston 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 April 2023.

How much traffic does 61st Avenue over Ralston Creek carry?

About 184 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is 61st Avenue over Ralston Creek?

The structure is 28 ft (8.5 m) long with a longest span of 13 ft (4.1 m) and a deck 44 ft wide.

Who owns 61st Avenue over Ralston Creek?

It is owned by the City or Municipal Highway Agency.