Issaquah-class ferry

The Issaquah class are a series of six auto and passenger ferries built for the Washington State Ferries system in the late 1970s until the early 1980s.

For other uses, see Issaquah (disambiguation).
Issaquah-class ferry
The original Issaquah-class vessel Sealth at left with upgraded vessel Chelan at right
Class overview
BuildersMarine Power and Equipment, Seattle, Washington
OperatorsWashington State Ferries
Built1979–1982
In serviceMay 1980–present[1]
Completed6
Active6
General characteristics [2]
TypeAuto/passenger ferry
Tonnage2,477 gross tonnage (GT)
Displacement3,310 long tons of displacement
Length328 ft (100 m)
Beam78 ft 8 in (23.98 m)
Decks3 or 4 (1 or 2 auto decks, passenger deck, nav bridge deck)
Deck clearance15 ft 2 in–15 ft 10 in (4.6–4.8 m)
Propulsion5,000 hp (3,700 kW) total from two diesel engines
Speed16 knots (30 km/h; 18 mph)
Capacity
  • 1,200 passengers (1,090 on international service)
  • Sealth: 90 vehicles (30 tall vehicles)
  • Others: 124 vehicles (24 tall vehicles)
Crew14

Originally, each vessel was built to accommodate 100 vehicles and 1,200 passengers but were built with accommodations to add an additional car deck. In the early to mid-1990s, five of the six vessels were modified with the additional car deck. The lone exception is the MV Sealth, which Washington State Ferries assigns to the San Juan Islands route in the summer, where her additional capacity for tall vehicles without the second deck has proven useful.[3]

The Chelan was upgraded to international SOLAS safety standards in 2005, allowing her to make the crossing between Anacortes and Sidney, British Columbia.[4][5]

History

The Issaquah class got off to a problematic start, when the $106 million contract to build the six ferries was awarded to Marine Power and Equipment (MP&E) on April 6, 1978. The company had no prior experience building large vessels, and it was later revealed that some lawmakers may have personally benefited from the contract being awarded to MP&E.[6]

As it built the Issaquah class, MP&E was accused of substituting cheap materials and cheap labor and groups said that it was enabled by poor oversight by the Washington State Department of Transportation. The largest problem with the ferries was the propulsion system. Prior vessels purchased for Washington State Ferries had used a diesel–electric transmission, where diesel engines turned an electric generator, which produced electricity, which in turn was used to power electric motors that turned the propellers. Instead MP&E chose a more traditional setup with diesel engines turning the propellers through a series of clutches and gearboxes, which turned out to be extremely problematic causing the vessels to ram the terminal piers, and in one case, inadvertently dropping into reverse while docked, causing a car to fall into the water.[7][8]

Vessels

Ferries in this class include:

  • Cathlamet – (Auto capacity increased in 1993)
  • Chelan – (Auto capacity increased in 2001, upgraded to meet SOLAS safety standards)
  • Issaquah – (Auto capacity increased in 1989)
  • Kitsap – (Auto capacity increased in 1992)
  • Kittitas – (Auto capacity increased in 1990)
  • Sealth

References
  1. Colton, Tim (2008). "Marine Power & Equipment". shipbuildinghistory.com. Archived from the original on November 4, 2011. Retrieved February 5, 2012.
  2. "M/V Sealth". Washington State Dept of Transportation. 2012. Retrieved February 5, 2012.
  3. "The M/V Sealth". Evergreen Fleet. Archived from the original on July 28, 2020. Retrieved December 20, 2021.
  4. "The International Ferry to Sidney--The M/V CHELAN". Evergreen Fleet. Archived from the original on July 28, 2020. Retrieved December 20, 2021.
  5. "The Issaquah Class". Evergreen Fleet. Archived from the original on July 28, 2020. Retrieved December 20, 2021.
  6. Wilson, Duff (January 8, 1986). "Unanswered Questions - Taxpayers Lose in Marine Power Deal". Seattle Post-Intelligencer. p. C6. Retrieved December 20, 2021 – via NewsBank.
  7. "The evolution of WSF ferries over the decade". Kingston Community News. September 9, 2013. Retrieved December 20, 2021 – via NewsBank.
  8. Whitely, Walter; Hatch, Peyton (June 25, 1985). "STATE SETTLES SUIT FOR $8 MILLION". Seattle Times. p. B1. Retrieved December 20, 2021 – via NewsBank.
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