Good afternoon:
Sorry this got my dander up... but try this.
The target is RCW 47.42.40, sections (3) and (8).
I've tried some verbage that would, I believe, more fully meet your intent (draft in bold):
RCW 47.42.40 - permitted sign uses
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(3) (a) Signs
advertising activities conducted on the property on which they are located, or,
(b) permanent business enterprises located on a connecting public right of way
that is the only ingress or egress to the main traveled way may have one sign,
not to exceed thirty-two square feet, located on property adjacent to the main
traveled way, with the permission of the property owner.
That one may be too all-encompassing for some, but it doesn't "give away the store", i.e. 4 miles of scenic designation. "Permanent business enterprises" is not intended to include the construction of a subdivision.
You also may have "peak" seasons, if that's the case, try this one from paragraph (8):
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(8) Temporary
agricultural or recreational directional signs, with the following
restrictions:
(a) Signs shall be posted only during the period of
time the seasonal agricultural or recreational product or
activity is being sold, not to exceed 180 days;
(b) Signs shall not be placed adjacent to the
interstate highway system unless the sign qualifies as an on-premise sign;
(c) Signs shall not be placed within an incorporated
city or town;
(d) Premises on which the seasonal agricultural or
recreational products are sold must be within fifteen miles of the
state highway, and necessary supplemental signing on local roads must be
provided before the installation of the signs on the state highway;
This may work from opening day of fishing season, through the summer. The time limit, I think, is palatable. This would also work for small ski areas, private campgrounds, and the like for winter/summer activities. DOT would still call the shots on location, hazards, time frame, etc.
Hope this helps. It's better than giving away the store, and if I'm going to gripe, I better have a solution. Here it is.
For now, I'm going fishing.
D