Northern Marine Construction

Seattle Marine Contractor

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Call Us At:
206.459.1737

Copyright © 2026 · Northern Marine Construction · Website Customization by Cascade Valley Designs

Vessel Specs

“Sea Horse” Vessel Spec’s

Length Overall 107.6′
Breadth Over Guards 42′
Depth Molded 7′
Draft 5.5′
Main Engines: Twin CATD343 T/A 415 HP
Fuel Oil Capacity 14,000 Gal.
Fresh Water Capacity 3,000 Gal.
Accommodations 13 Crew

boat1

Deck

  • 1″ Steel
  • 48″ Moon Pool
  • 4 Access Hateches to Storage Rooms
  • 90,000 lb. “D” Rings every 10′ on Deck
  • 20′ Containers Store beside Wheelhouse
  • External hydraulic fittings on deck

Machine Shop

  • Generators, 1-50kw, 1-40kw, 1-20kw
  • 250 AMP Welder
  • Hydraulic hose crimp machine
  • Drill press
  • Lathe 7.5 X 12″
  • Oxygen & Acetylene cutting, welding
  • Arbor press, Bench grinder
  • Air compressorsANCHORING
  • 4 – 1,000 lb Danforth Anchors
  • 4 – Gearmatic Winches (20,000 lb line pull) with 800′ of 3/4″ cable capacity
  • 1 – stern towing winch (50,000 lb line pull)
  • 2 – 50′ spuds
  • 4 – 40′ shots of 1 1/2″ anchor chain

Crane Barge Sea Horse Load Chart

130 FT Boom

R (ft) L (#) H (ft) A (‘)
30 52,300 137 78.1
35 44,800 135 75.8
40 38,200 133 73.5
50 29,000 130 68.9
60 23,100 125 64.1
70 18,800 120 59.1
80 15,700 113 53.8
90 13,200 104 48.1
100 11,300 93 41.8
110 9,700 80 34.7
120 8,400 60 26
130 7,200 10 12.7

boat2