US Bridges

Mill ST over Twin Warm Creek

Fair

San Bernardino County, California · 0.15 MI W Waterman Ave · Structure no. 54C0363

Built
1959
66 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
1 main span
Daily traffic
12,264
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill ST over Twin Warm Creek is a steel stringer/multi-beam or girder carrying Mill ST over Twin Warm Creek in San Bernardino County, California. It was built in 1959, so it is 66 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 12,264 vehicles a day, roughly 5% of them trucks, projected to reach 28,372 by 2046. The structure is 104 ft (31.7 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMill ST
CrossesTwin Warm Creek
Location0.15 MI W Waterman Ave
RouteCity Street 0
CountySan Bernardino County
StateCalifornia
Coordinates34.09206, -117.28167
Functional classUrban Minor 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 protection9 ExcellentNo problems noted.
Last inspectionJanuary 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length104 ft (31.7 m)
Longest span99 ft (30.2 m)
Deck width64 ft (19.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,264 (2016)
Projected traffic28,372 by 2046
Trucks5%
Lanes on structure4
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 Mill ST over Twin Warm Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Mill ST over Twin Warm 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 January 2024.

How much traffic does Mill ST over Twin Warm Creek carry?

About 12,264 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Mill ST over Twin Warm Creek?

The structure is 104 ft (31.7 m) long with a longest span of 99 ft (30.2 m) and a deck 64 ft wide.

Who owns Mill ST over Twin Warm Creek?

It is owned by the City or Municipal Highway Agency.