Pacific Northwest Diving: Tides, Logs and Cold Water
By Ray Whitfield, ADCI-certified commercial dive supervisor. Reviewed by Dana Whitcombe, technical reviewer.
Marine Construction | Boat Lift Installation Last April I was changing out a trash rack on the Willamette, near the St. Johns Bridge, when the bottom turned pitch black. Not just dark. Pitch. A log had come down on top of my light and my world went to zero visibility at thirty feet. I tucked, grabbed my umbilical, and waited. That's the job in the Pacific Northwest -- you spend half your time managing what the river throws at you, and the other half just doing the work. Most people think diving is clear water and white sand. Not here. We've got glaciers, rain, and the biggest river systems on the continent. Water temp in Puget Sound these days? Call it 48°F in August, 42°F in February, give or take. Currents at the Narrows can rip at six knots on a bad exchange. And visibility? I've had days when the light on my helmet lit up my own snot. The work isn't glamorous. It's dams, intakes, bridge piles, and the occasional car pulled out of a boat ramp. But after 28 years, I still love it. So here's a practical look at what commercial diving looks like in the Pacific Northwest -- the good, the cold, and the loggy.
The Water Itself
First, let's talk about the water. Puget Sound is saltwater, influenced by the Pacific tide. The Columbia River is massive, and the lower river is a mix of fresh and salt. That means you're dealing with thermoclines, density layers, and a constant conveyor belt of silt and wood. Tides matter more here than anywhere I've worked. The difference between high and low at the Columbia's mouth can be twelve feet. That's a lot of water moving, and you don't dive on the worst part of the exchange. We plan around slack water. That might mean a 20-minute window in a six-hour shift. You learn to get a lot done in a short time. And it's cold. Hypothermia is real, even with a hot water suit. Your hands go numb after an hour, and your face is numb even with a wet glove. We use a Miller 481 hot water system on the surface -- that runs a boiler that heats sea water to about 100°F and pumps it down to the suit. It's a lifesaver, literally.
Logs and Debris
Now, logs. The Pacific Northwest is forest country. Every river has timber in it, and a lot of it is waterlogged, just below the surface. You'll be working on a pile or a structure, and the current will bring a log at chest height. Your surface support is watching from above, but they can't see everything. The dive tender is your eyes. I had a diver on a job once, a young guy from Florida. He saw a log coming on the sonar and panicked, started swimming away. His umbilical wrapped around a barge anchor. We had to cut the job and reel him in. He didn't come back. The thing is, you don't outrun logs. You either duck under them or let them pass over you. A log moving at 2 knots is a lot of mass, but it's also just a log. If you stay calm, it'll go by. The debris isn't just logs. Fishing line, tires, shopping carts, old anchors. I've had my air hose fouled by a tangle of net from a crab pot. That's why we use Kirby Morgan 37 helmets with the voice comms -- you need to talk your tender through clearing a snag while you're still breathing. And you always carry: a knife, a second knife, and a pair of dykes.
Gear and Rigging
Let's talk gear. For the water up here, you want a hot water suit, not just a dry suit. A dry suit traps air and you fight buoyancy. A hot water suit is a wet suit with hoses that run warm water around your body. It's like wrapping yourself in a heated blanket that's also SCUBA gear. We use Miller hats, Kirby Morgan, and the classic AMRON 3-bolt for the old-school guys. But the real kit isn't the suit, it's the diver. You need a good tender on the surface. The tender is your hands and eyes. He's watching your umbilical, tracking your depth, managing your air. I've had tenders who could tell by the sound of my breathing whether I was in trouble. That's not something you learn in a school. One thing people don't talk about is your buoyancy. In the PNW, you're often working in complete darkness with a heavy suit. You need to learn to control your attitude -- not just the gear. I tell my students: the water doesn't care. You're just a package of meat and steel, and the current will roll you like a tumbleweed.
Working the Inland Jobs
The jobs themselves are mostly industrial. I've done inspections at the Bonneville Dam, cleaned intake screens at power plants, and swapped a bridge fender that got knocked loose by a barge. You're not doing underwater photography; you're doing underwater construction. That means pulling bolts, cutting steel, driving pins, and working with your hands almost blind. A typical job might be a hydro plant intake. The plant shuts down a unit for maintenance, and you go down with a grinder and a wire brush to clean the trash rack. The water is moving at maybe 1 to 2 knots, but it's full of silt and fingernails of steel. You work in teams of two divers -- one in the water, one standing by. The surface crew runs the compressor and the hot water and the comms. Contract work is often short-term. You might spend a week on the Columbia, then drive over to the coast for a salvage job. It's not for someone who wants stable weekends. But it pays. A commercial diver in the PNW can make a living -- call it $25 to $45 an hour for an experienced tender, and $50 to $75 for a dive supervisor, depending on the job and the certs. And the work is always there because the dams and bridges aren't going anywhere.
The Human Side
You don't stay 28 years in this without a strong crew. I've worked with guys who were ex-Navy salvage divers, a couple from the Gulf shrimp boats, and one guy who was a high school math teacher before he got his ADCI card. The common thread is they're all stubborn as hell. The tool of the trade is communication. Underwater you can't see anything, so you rely on sonar, the surface, and your own hands. A good tender can talk you through a task: 'Okay, your 10 o'clock, reach forward, you'll feel a bolt. Now grab it and turn.' You learn to listen to your tug. One thing I've noticed after all these years is that the guys who respect the water are the ones still alive. The water will teach you humility. You might be diving in a drysuit and a hot water suit, but if you're careless and go outside the pattern, the current can suck you into a trash rack. That's not an accident. That's a mistake. I've had three close calls where I thought about my family. The fourth was the log story I started with. Now I don't dive anywhere without a backup buoyancy device.
Frequently Asked Questions
What's the water temperature in the Pacific Northwest for commercial diving? Depending on the site and season, it's usually 40°F to 50°F. The Columbia River can be colder than Puget Sound, especially in the spring with snowmelt. We use hot water suits to keep working safely. How do you see anything underwater in the PNW? Most of the time, you don't. Visibility can be zero. We work by feel, using the helmet's light for the occasional shape, and we rely on the dive tender and a good understanding of the job plan. Sonar on the surface helps locate structures, but the diver is often blind. What's the biggest hazard for commercial divers in the PNW? Logs and debris are unique to this region. A waterlogged log moving with the current can crush you against a structure. Strong currents and cold water are also serious hazards, which is why we tailor every dive to slack tide and continuous surface monitoring. Do I need a special certification to dive commercially in the Pacific Northwest? You need an ADCI certification from a recognized school, plus a HAZWOPER 40-hour card and often a valid TWIC. Then you'll typically start as a tender, working your way up to diver and supervisor. Firms like Global Diving & Salvage or Pacific Coast Pile Driving hire locally, but it's a small community and reputation matters.