US Bridges

Boulder Ave over Elder Gulch

Fair

San Bernardino County, California · 1.8 MI N of Pioneer Ave · Structure no. 54C0591

Built
1949
76 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
58 ft
2 main spans
Daily traffic
10,900
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Boulder Ave over Elder Gulch is a concrete continuous slab carrying Boulder Ave over Elder Gulch in San Bernardino County, California. It was built in 1949, so it is 76 years old, older than the California average of 54.8 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 10,900 vehicles a day, roughly 5% of them trucks, projected to reach 13,800 by 2044. The structure is 58 ft (17.7 m) long and 70 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBoulder Ave
CrossesElder Gulch
Location1.8 MI N of Pioneer Ave
RouteCounty Highway 0
CountySan Bernardino County
StateCalifornia
Coordinates34.10679, -117.18362
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating47.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length58 ft (17.7 m)
Longest span28 ft (8.5 m)
Deck width70 ft (21.3 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,900 (2018)
Projected traffic13,800 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Boulder Ave over Elder Gulch built?

It was built in 1949, making it 76 years old in 2025.

What condition is Boulder Ave over Elder Gulch 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 2024.

How much traffic does Boulder Ave over Elder Gulch carry?

About 10,900 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Boulder Ave over Elder Gulch?

The structure is 58 ft (17.7 m) long with a longest span of 28 ft (8.5 m) and a deck 70 ft wide.

Who owns Boulder Ave over Elder Gulch?

It is owned by the City or Municipal Highway Agency.