OR Stae Park between Lincoln City & Walport for 42' RV?

Beverly Beach in Newport has sites that would work for you, but RVcrazy says site descriptions are all available online.

Not that I remember for that length. See "How long are the sites" at http://oregonstateparks.org/index.cfm?do=visit.dsp_faq This was easy to find so there may be others. I'd be interested if you find one.

42 foot fiver? None. At least none on the coast. Start looking for private parks.

Oregon state parks have the length of each space online. IMO, you should consider the Newport Marina RV park, but not the Annex. Waldport KOA might have a couple of spots. The state parks are lovely, but predate such long units...