Loon Lake RD #3 over Topping Slough
FairDouglas County, Oregon · 2.5 MI S Loon Lake · Structure no. 19C329000301111
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected August 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 81 ft
- 2 main spans
- Daily traffic
- 217
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Loon Lake RD #3 over Topping Slough is a prestressed concrete slab carrying Loon Lake RD #3 over Topping Slough in Douglas County, Oregon. It was built in 1973, so it is 52 years old, older than the Oregon average of 49.9 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 217 vehicles a day, roughly 20% of them trucks, projected to reach 247 by 2025. The structure is 81 ft (24.7 m) long and 32 ft wide. 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Loon Lake RD #3 over Topping Slough built?
It was built in 1973, making it 52 years old in 2025.
What condition is Loon Lake RD #3 over Topping Slough 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 August 2024.
How much traffic does Loon Lake RD #3 over Topping Slough carry?
About 217 vehicles per day (2020 count), of which roughly 20% are trucks.
How long is Loon Lake RD #3 over Topping Slough?
The structure is 81 ft (24.7 m) long with a longest span of 39 ft (11.9 m) and a deck 32 ft wide.
Who owns Loon Lake RD #3 over Topping Slough?
It is owned by the County Highway Agency.