US Bridges

Sunset Street over Saint Vrain Creek

Good

Boulder County, Colorado · 0.1 S Boston Ave · Structure no. LONG-SUNS-BOST

Built
2016
9 years old
Condition
Good
inspected January 2025
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
210 ft
3 main spans
Daily traffic
7,282
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sunset Street over Saint Vrain Creek is a prestressed concrete box beam or girders - single or spread carrying Sunset Street over Saint Vrain Creek in Boulder County, Colorado. It was built in 2016, so it is 9 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 7,282 vehicles a day, roughly 7% of them trucks, projected to reach 8,738 by 2043. The structure is 210 ft (64 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSunset Street
CrossesSaint Vrain Creek
Location0.1 S Boston Ave
RouteCity Street 0
Coordinates40.16117, -105.12133
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating28.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length210 ft (64 m)
Longest span67 ft (20.5 m)
Deck width49 ft (14.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,282 (2023)
Projected traffic8,738 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sunset Street over Saint Vrain Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is Sunset Street over Saint Vrain 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 January 2025.

How much traffic does Sunset Street over Saint Vrain Creek carry?

About 7,282 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Sunset Street over Saint Vrain Creek?

The structure is 210 ft (64 m) long with a longest span of 67 ft (20.5 m) and a deck 49 ft wide.

Who owns Sunset Street over Saint Vrain Creek?

It is owned by the City or Municipal Highway Agency.