US Bridges

Angeles Forest HWY over Mill Crk

Good

Los Angeles County, California · 1.2MI S/O Uppr Big T Cn · Structure no. 53C0600

Built
1940
85 years old, rebuilt 1973
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
3,162
2017 count
Owner
County
County Highway Agency

About this bridge

Angeles Forest HWY over Mill Crk is a steel stringer/multi-beam or girder carrying Angeles Forest HWY over Mill Crk in Los Angeles County, California. It was built in 1940 and reconstructed in 1973, so it is 85 years old, older than the California average of 54.8 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 3,162 vehicles a day, roughly 2% of them trucks, projected to reach 3,478 by 2042. The structure is 81 ft (24.7 m) long and 33 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesAngeles Forest HWY
CrossesMill Crk
Location1.2MI S/O Uppr Big T Cn
RouteCounty Highway 0W481
Coordinates34.31696, -118.13583
Functional classRural Major 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating53.6 US tons
Inventory rating41.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span74 ft (22.6 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,162 (2017)
Projected traffic3,478 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Angeles Forest HWY over Mill Crk built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1973.

What condition is Angeles Forest HWY over Mill Crk 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 May 2024.

How much traffic does Angeles Forest HWY over Mill Crk carry?

About 3,162 vehicles per day (2017 count), of which roughly 2% are trucks.

How long is Angeles Forest HWY over Mill Crk?

The structure is 81 ft (24.7 m) long with a longest span of 74 ft (22.6 m) and a deck 33 ft wide.

Who owns Angeles Forest HWY over Mill Crk?

It is owned by the County Highway Agency.