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What is the Mosquito Fleet?

The Mosquito Fleet was the myriad of steamboats that served the Puget Sound’s  shipping and transit needs for the more than 50 years that straddled the dawn of the 20th century. The name, so the story goes, came from a fellow in an office overlooking Elliot Bay and remarking as he observed all the boat activity that it looked like a “swarm of mosquitoes.”

In the early 1850’s, as the settler population grew, ancillary businesses developed; stores, brickyards, boat builders, dry docks, hotels and services for summer visitors. Since there were only trails in this land, heavily forested to the water’s edge, the population was supported by the steamboats collectively called the Mosquito Fleet that used the Sound as a watery freeway to move mail, products and passengers.

Steamship dining roomThe fleet was the lifeblood of the community and commerce that launched the Pacific Northwest. Steamer schedules governed daily lives, and the whistle of an approaching boat was the call to collect the mail, greet friends, or send a package. To ride on a steamboat was an occasion, a chance to visit and enjoy the leisurely, often long passage to the city. Old-timers recall the smooth, gleaming wood on the passenger cabins, the box lunches en route, and the fact that, for a child, the journey enlarged the world.

Mosquito Fleet boats preparing to deploy

About the Boats

In short, a Mosquito Fleet boat was a craft of any size that performed any required task on Puget Sound.

Mosquito Fleet boats came in all sizes


The smallest was less than 40 feet long and the largest nearly 300 feet. As passenger and freight businesses grew, the boats became larger, and there came a distinction in nomenclature. Generally boats over 50 feet were called steamboats; those under that were called launches.


When they first arrived (the Beaver was the earliest to the Northwest in 1836), these boats ran all over Puget Sound and even into Canada. They simply went where they were needed. By 1880, they began to settle into regular routes, though boats changed hands and moved to different parts of Puget Sound quite often.

Steamer Fleetwood schedule


In the beginning, they were steam powered, first by wood, later by coal, and still later by oil. There were experiments: non-steam engines boiled naptha (an idea soon abandoned) and then, more safely, were fueled with gasoline. Boilers sometimes exploded, or heat caused fires with disastrous results. 


They fleet delivered passengers, mail, newspapers, produce, fish, eggs, bricks, shingles, brush, logs and more. Basically if there was water access and it could be loaded or towed, a Mosquito Fleet boat took care of it.

So many boats did so many different duties that it was not always possible to define a boat as a tugboat, freight boat, or passenger boat.


Historic steamer on Puget Sound

The End of an Era

Mosquito Fleet crewThe Mosquito Fleet era ended as customers switched their allegiance to cars and paved highways. The traditional design of the steamers were outmoded, too, as newer boats came down the ways with gasoline or diesel motors instead of steam, propellers instead of paddle wheels, and steel instead of wooden hulls. To survive, the fleet tried to adapt, the larger boats finding new life as ferries, the smaller ones as tugboats, freighters, or excursion boats. Ultimately, they did not endure. By the 1920’s, car ferries were taking over, and passenger-only patronage was declining. By the 1930s, they were gone.