Osage seems to be the favorite, perhaps one reason being because it is a good choice for all seasons? Although as Sidewinder pointed out, it might be too long a paddle from here to find some staves. Would it be fair to generalize that oily or resinous woods are less prone to moisture uptake than white woods of comparable density? I will have to give the shrubs a second look this summer, as Pacific Serviceberry ( Amelanchier florida) and Saskatoon Serviceberry (Amelanchier anifolia) are reported to be present here in south central Alaska, although Ocean spray is not. Oregon Crab Apple (Malus diversifolia) is another that might have the desired denseness. All local hardwood trees I have found so far, (paper birch, bebb willow, aspen, cottonwood and alder) are white and light (< 50 S.G.) I did find some black spruce (Picea mariana) in the swamp that has 120 rings per inch in the outer sapwood, and it's the densest wood I have found so far.
Thanks to all who have shared their expertise thus far
Bob