Highland Lake RD over Mokelumne River
FairAlpine County, California · 3.3 MI S of S.H. 4 · Structure no. 31C0019
- Built
- 1989
- 36 years old
- Condition
- Fair
- inspected September 2023
- Type
- Arch - Deck
- Steel
- Length
- 23 ft
- 1 main span
- Daily traffic
- 25
- 1990 count
- Owner
- County
- County Highway Agency
About this bridge
Highland Lake RD over Mokelumne River is a steel arch - deck carrying Highland Lake RD over Mokelumne River in Alpine County, California. It was built in 1989, so it is 36 years old, younger 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 25 vehicles a day, roughly 3% of them trucks, projected to reach 21 by 2041. The structure is 23 ft (7 m) long. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Highland Lake RD over Mokelumne River built?
It was built in 1989, making it 36 years old in 2025.
What condition is Highland Lake RD over Mokelumne River 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 September 2023.
How much traffic does Highland Lake RD over Mokelumne River carry?
About 25 vehicles per day (1990 count), of which roughly 3% are trucks.
How long is Highland Lake RD over Mokelumne River?
The structure is 23 ft (7 m) long with a longest span of 23 ft (7 m).
Who owns Highland Lake RD over Mokelumne River?
It is owned by the County Highway Agency.