US Bridges

Garrison Street over Ralston Creek

Good

Jefferson County, Colorado · Just S of Brooks DR · Structure no. ARVA-GN-0.15-1A

Built
2013
12 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
108 ft
2 main spans
Daily traffic
3,986
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Garrison Street over Ralston Creek is a prestressed concrete continuous box beam or girders - multiple carrying Garrison Street over Ralston Creek in Jefferson County, Colorado. It was built in 2013, so it is 12 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,986 vehicles a day, roughly 2% of them trucks, projected to reach 4,584 by 2041. The structure is 108 ft (32.8 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesGarrison Street
CrossesRalston Creek
LocationJust S of Brooks DR
RouteCity Street 0
Coordinates39.80357, -105.10013
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length108 ft (32.8 m)
Longest span50 ft (15.2 m)
Deck width62 ft (18.9 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,986 (2021)
Projected traffic4,584 by 2041
Trucks2%
Lanes on structure3
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 Garrison Street over Ralston Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is Garrison Street over Ralston Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does Garrison Street over Ralston Creek carry?

About 3,986 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Garrison Street over Ralston Creek?

The structure is 108 ft (32.8 m) long with a longest span of 50 ft (15.2 m) and a deck 62 ft wide.

Who owns Garrison Street over Ralston Creek?

It is owned by the City or Municipal Highway Agency.