SE Mud Mt RD over Boise Creek
PoorPosted for loadKing County, Washington · 0.1 MI SE of SR-410 · Structure no. 084644000000000
- Built
- 1956
- 69 years old
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 38 ft
- 1 main span
- Daily traffic
- 947
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
SE Mud Mt RD over Boise Creek is a steel stringer/multi-beam or girder carrying SE Mud Mt RD over Boise Creek in King County, Washington. It was built in 1956, so it is 69 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 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. Its operating status is: posted for load restriction.
It carries about 947 vehicles a day, roughly 2% of them trucks, projected to reach 1,155 by 2040. The structure is 38 ft (11.6 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 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 |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, 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 SE Mud Mt RD over Boise Creek built?
It was built in 1956, making it 69 years old in 2025.
What condition is SE Mud Mt RD over Boise Creek 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 July 2024.
How much traffic does SE Mud Mt RD over Boise Creek carry?
About 947 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is SE Mud Mt RD over Boise Creek?
The structure is 38 ft (11.6 m) long with a longest span of 37 ft (11.3 m) and a deck 22 ft wide.
Who owns SE Mud Mt RD over Boise Creek?
It is owned by the County Highway Agency.