Alaska Diving: The 62-Point Seasonal Swing

By Ray Whitfield, ADCI-certified commercial dive supervisor. Reviewed by Dana Whitcombe, technical reviewer.

Commercial Diving Contractors Alabama | Commercial Diving Contractors Alaska First week of April on the north side of Sitka Harbor, the water was a flat, gray 38 degrees Fahrenheit and the light was gone by 6 PM. I put a diver in the water for a dock inspection and the vis was maybe eight feet. By the first week of August, same site, I clocked a sixty-two-foot horizontal visibility with a Secchi disc and a dive light. That's what I mean by the 62-point swing. It's not just the numbers. The swing changes your whole approach: in April you're working with a light head, a dead-reckoning line, and you're sweating on the tether because you can't see the diver's bubbles. In August, the same job is a different animal. You can fly a drone underwater and video the pile, check the mussel growth, and get it done in a third of the time. Every Alaska dive project is a bet on that swing. The commercial diving season here runs from May to October, call it. That's when the ice allows, when the day length hits double digits, and when the visibility opens up enough to actually see what you're doing. The rest of the year is for maintenance, welding, and waiting.

What the 62-Point Swing Means on a Worksite

On a typical job at a dam, you're inspecting a trash rack or a penstock grate. In the spring, the water comes down from snowmelt carrying silt and even chunks of ice. You're lucky to see your hand in front of the helmet faceplate. That forces you to work by touch. You essentially do a blind court of a structure, feeling for cracks, missing bolts, and buildup. It's slow, and it's demanding on your positioning. You need a good tender and a lot of patience. In late summer, the same site might give you thirty or forty feet of clear water, and I've seen sixty-two feet on a calm day in a clear fjord with no glacial silt. That's the swing I'm talking about. It changes your bid, your schedule, and your diver's stress level. The dirty secret is that a lot of Alaska work doesn't happen in the summer. The highest demand is actually early fall, before the freeze, because the plants want their intakes cleaned and hydro operators need to inspect before the ice sets. So the season is two phases: June and July for the slack tide window, and September into October for the pre-freeze push. Call it May to October, but the real season is what you make of it, and the visibility swing is your guide.

Season Length: May to October, Give or Take

Look at any calendar for Alaska work and you'll see it blocks out from the last ice-out to the first skim ice. That's maybe 22 weeks on a good year. But the window isn't the same everywhere. Southcentral and the Aleutians have their own dance with the ice, and the Fairebank area is completely locked down by November. We've had jobs in January in Ketchikan because the water doesn't freeze in the strait, but those are rare and they pay a premium. The season is a spectrum, and the older you get, the more you appreciate the late-season jobs because the days are shorter but the visibility is better. The work is governed by the ice, the light, and the fish. We have to schedule around salmon runs, too, because you can't be grubbing around an intake when the fish ladder is crowded. So the season is a set of constraints that shift every year. A warm winter can push the season a week earlier; a cold spring can wipe it out. That's why we hedge our bids with contingencies for ice and weather. The bottom line is that the season is a window, not a slot.

Gear That Works in Hard Water

Nobody dives in this stuff without a Kirby Morgan 37 and a Viking drysuit. I've seen guys on the docks with cheap wetsuits and it's a solid no. You need a drysuit with a proper neck seal and dry gloves, and you need a redundant heat source. I'm a fan of hot-water suits for work that lasts more than a couple of hours, but those are a pain on a small site because you need a boiler on deck. So we usually go with a passive insulation system: something like Weezle under the drysuit, and a pair of Halo gloves if your hands are in the water a lot. The key is the glove. I've had a dry glove crack at 38 degrees and the diver felt like his hand was on fire. That's a forced surface call. One time we had a new diver who insisted on wearing his own neck ring because it had a better fit. The thing popped in the first ten minutes and he came up with his ears barely submerged. We spent an hour getting him dried and warmed up before the next dive. After that, we checked every ring myself. The other piece is the helmet light. You need a primary and a back-up, and I'll take a sealed beam any day. You also run a surface voice system -- we use Divecom or a hard-wire. And at those temperatures, communication is everything. We also carry a full OMNI mask for emergency, but we've never used it. Call it insurance.

The Money: How It's Priced

Pricing in Alaska is per project, not per hour. Owners know the season is short and they're doing a bid once a year, so they'd rather have a flat number than an open-ended timesheet. We'll quote a daily rate for a diver with a tender and a decompression trailer, and that rate depends on the plant. Some plants have their own safety team and we work under their rules; others just point at the lake. So you have to factor in the logistics. You can't just set a rate chart; you have to know the access, the ice, the tide, and the visibility forecast. You'll see numbers like $900 to $1,500 a day for a two-diver team, but that's the least of it. The real money is in mobilization -- getting the equipment to the site. In Alaska, that can involve a barge, a helicopter, or a plane, and that's where the contract gets complicated. A good operator loves the out-of-the-way places because you can charge for transit and setup. But the risk is that the weather eats your schedule. So we price in a 'stand big' clause that allows for weather delays. Call it a hedge.

Getting On a Crew Up Here

If you want to dive commercially in Alaska, the first thing is your ADCI card. That's the entry point. Then you need a full class with your HAZWOPER, CPR/oxygen, and a Canadian certification if you're working on the boundary waters. But the more important thing is local reputation. I've got a network of tenders and divers who've been on the coast for years, and we all know each other's habits. A newcomer with only school hours is not going to land a seat on our boat unless they run a solid week as a tender first. Check the job boards and the dive company websites. Big outfits like Global Diving and Salvage sometimes have Alaska work, and there are local operations like Deluth or maybe 'Alaska Dive and Marine'. But the best route is to call the superintendents and ask to be on a call-out list. Most of the time we're scrambling for a diver at the last minute, and we'd rather use someone we've worked with. So it's about showing up at the dock with a proper bag and a good attitude. That'll get you further than a hundred hours of NDC training.

Frequently Asked Questions

When is the Alaskan commercial diving season? Historically, it runs from May to October, but the reliable window is June through September. Ice and weather can shift it two weeks in either direction. Do I need special certification to dive in Alaska? Yes. You need a current ADCI card, CPR/first aid, and HAZWOPER for contaminated sites. Some plants also want an H2S card and cold-water operations training. How cold is the water during the season? In summer, surface temps in the Inside Passage can hit 55 degrees Fahrenheit, but at working depth you're usually in the 40s. In spring and fall, it's typically 34 to 38 degrees. What is the 62-point swing? It's the seasonal swing in visibility: from zero feet in the spring when silt and ice are running, to 62 feet in late summer in a clear, sheltered spot. That swing drives dive planning and safety.