Fourth Avenue over Seward Lagoon
PoorKenai Peninsula Borough, Alaska · Mile Point 0.5 · Structure no. 4128
- Built
- 1960
- 65 years old
- Condition
- Poor
- inspected August 2023
- Type
- Culvert
- Steel
- Length
- 41 ft
- 3 main spans
- Daily traffic
- 500
- 2018 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Fourth Avenue over Seward Lagoon is a steel culvert carrying Fourth Avenue over Seward Lagoon in Kenai Peninsula Borough, Alaska. It was built in 1960, so it is 65 years old, older than the Alaska average of 35.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 500 vehicles a day, roughly 1% of them trucks, projected to reach 600 by 2035. The structure is 41 ft (12.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Fourth Avenue over Seward Lagoon built?
It was built in 1960, making it 65 years old in 2025.
What condition is Fourth Avenue over Seward Lagoon in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.
How much traffic does Fourth Avenue over Seward Lagoon carry?
About 500 vehicles per day (2018 count), of which roughly 1% are trucks.
How long is Fourth Avenue over Seward Lagoon?
The structure is 41 ft (12.5 m) long with a longest span of 6 ft (1.8 m).
Who owns Fourth Avenue over Seward Lagoon?
It is owned by the City or Municipal Highway Agency.