By Cara Mitchell
![]() |
SR 104 Hood Canal Bridge closed to vehicles but open for marine traffic during a boat opening. Marine openings are required by Federal law. |
The State Route 104 Hood Canal Bridge is no ordinary bridge. Surrounded in salt water more than 300 feet deep, it floats like a boat on the surface of Hood Canal. On average 18,000 vehicles a day use the bridge. Communities in Jefferson and Kitsap counties use the bridge to get to appointments, work, school and vacation destinations. It’s also a key gateway for tourists who flock to the Olympic Peninsula.
Timeline
At 1 p.m. Monday, May 5, at the request of the United States Navy, we opened the bridge to allow for their boats to pass through. Per our protocols with any Department of Defense opening, our bridge cameras go dark. There is no advanced warning that the bridge is closing. This is done for security reasons.
We have a dedicated crew at the bridge with in-depth knowledge of the unique span. When they tried to close it so vehicles could drive across, the west half of the span wouldn’t move. Crews troubleshooted the issue for hours, but nothing worked.
They inspected gear boxes, power sources, motors and brakes. Everything looked fine, yet the west half wouldn’t budge. Our state bridge engineers, who were dispatched almost immediately following the malfunction, are based out of Olympia and were coming from work in Aberdeen. We knew the backups on US 101 might delay their arrival at the bridge, so we enlisted the help of Washington State Patrol to escort them through the backups.
Once state bridge engineers arrived at the bridge, they gave the okay to hook a tugboat up to the west half of the bridge. The tug gave it a pull. It worked. After that, the bridge was able to move on its own power. Out of an abundance of caution, we tested bridge functions one more time while the tugboat was on site. Again, the bridge behaved as it should. We opted to limit the marine openings to 300 feet until further inspections could be performed.
![]() |
A commercial tugboat and WSDOT
maintenance skiff in the waters along the Hood Canal before maneuvers to fix
the malfunctioning west span of the bridge just before sundown Monday, May 5. |
The next day, a bridge inspection team diver went down to look under the bridge. It allowed us to see if there were any obstructions beneath the icy waters of Hood Canal. The diver looked for evidence of debris stuck under the bridge or marine growth on the bridge bottom that could have caused the issue. They found nothing out of the ordinary. There was nothing that would have caused the bridge to malfunction. Another test opening took place Tuesday evening with the tugboat nearby. The bridge operated under its own power with no issues. The mystery deepened even further. The bridge works like normal. Nothing to indicate why it wouldn’t budge Monday night.
![]() |
A WSDOT bridge inspector in dive gear,
getting ready to inspect underwater portions of the floating Hood Canal Bridge
the day after it malfunctioned. |
Working theory to potential cause
There is no apparent mechanical or electrical cause. That leaves us with a working theory. It’s possible that some kind of underwater debris affected the span and dislodged when the tugboat pulled on the draw span.
When something isn’t working right, human instinct is to “diagnose and fix”. We would really like to pinpoint an exact cause. At the same time we have not seen any damage to the bridge. Our Hood Canal Bridge crew and state bridge engineers are continuing to evaluate this issue.
Why we open the bridge for boats
Under maritime rules, boats get the right-of-way over vehicles when bridges block the path of marine traffic. We understand it seems counterintuitive since there are more vehicles than marine vessels. However, long established law requires the Hood Canal Bridge and others like it (Title 33, Part 177 Draw Bridge Operations) to give marine traffic the right-of-way over vehicular traffic.
We have worked with regulators to prevent some seasonal drawspan openings. From May 22 to Sept. 30 each year, private vessels (pleasure craft) are prohibited from requesting a drawspan opening from 3 to 6:15 p.m. daily during the peak afternoon commute. The rule doesn’t apply to commercial, U.S Navy or other Department of Defense vessels.
But not all boats are the same and not all need the bridge to open. In those cases, the regulations require mariners to navigate under the truss spans of the bridge whenever possible. Mariners should not request draw span passage if their vertical clearance is enough to use elevated areas of the bridge.
Truss heights (smallest vertical clearances at Mean High Water) clearances vary based on tides and wave activity.
- Jefferson County (west) measures 31 feet
- Kitsap County (east) measures 50 feet
Requesting an unneeded draw span opening is a reportable offense to the United States Coast Guard and needlessly jams up traffic across the bridge.
Saltwater marine environment requires ongoing maintenance
When people drive across the third longest floating bridge in the world, they probably don’t think about what it means to be on a floating bridge on corrosive salt water.
The salty, marine environment requires the structure to have ongoing maintenance and construction.
The bridge is also regularly under pressure from wind, waves, and fast-moving tides. This past winter we’ve had to close the bridge due to strong winds and extreme tidal swings in the 300-foot-deep Hood Canal.
Because the bridge is so unique, many of its key elements are custom made. When a part wears out it takes a lot of time to fabricate and install a replacement. There is no other bridge like it in the world. Later this summer, we hope to wrap up work on the bridge’s center lock system, which is all custom work.
![]() |
Here’s one of two systems that helps keep both halves of the bridge in place. |
Extended bridge closures
We try to avoid extended closures of the bridge as much as possible.
We don’t control the weather though. Long closures for wind and strong tides happen.
In most cases, when there’s a mechanical problem our dedicated bridge crew can address it in less time than it takes for folks to travel the 3-hour detours by road along the Hood Canal or by boat using the Port Townsend Ferry.
Sometimes, extended closures are necessary to complete vital projects that keep the bridge operational. However, these are almost always at night with advanced notice to travelers.
When extended closures occur, we ask that travelers waiting on the shoulder of US 101, SR 104 or SR 3 for the bridge to open to not block driveways for property owners. This creates challenges for local communities.
How to check the Hood Canal Bridge status
We offer several ways for bridge users to stay up to date in real time. Add these handy links to your travel toolkit when you plan trips across the water:
- Sign up for bridge closure notifications
- Check the bridge status page
- Download the WSDOT app
- Follow us on X/Twitter or Bluesky
Please visit our online open house for more information about the 2025 construction season and to sign up for updates.