navigable

Adjective

navigable (comparative more navigable, superlative most navigable)

1. Capable of being navigated; deep enough and wide enough to afford passage to vessels.
   • Shanghai is situated on this river, about twelve miles above Woosung; and the river is navigable for steam-boats forty-seven miles higher up—to the point where it issues from the small lake on the south of the canal. Chapoo, the town taken by the British immediately before the attack upon Woosung...1842 November 26, “GEOGRAPHY OF THE DESPATCHES.”, in The Spectator, number 752, →ISSN, →OCLC, page 1139, column 2
   • [...] on July 16, 1790, a public meeting [...] unanimously approved of a scheme for making the River Soar navigable from Leicester to Loughborough, and "a cut or rail-way from Swannington and the neighbourhood to the bason at Loughborough."1939 July, Charles E. Lee, “Swannington: One-Time Railway Centre”, in Railway Magazine, page 3
2. Seaworthy; in a navigable state; steerable.
3. Steerable, dirigible.
4. Easy to navigate.
   • This Web site isn't very navigable. I can't tell which image links to which page.