DB has it right.
Here is the WDFW CR Endorsement link:
http://wdfw.wa.gov/licensing/crss_endorsement/And here is the description of the first area listed:
List of endorsement fee waters
Mainstem Columbia River from the Rocky Point/Tongue Point line to
Chief Joseph DamSo, the CR endorsement is not required for the B10 fishery no matter the length of any license nor age of angler.
As to who needs to buy an endorsement to fish in covered waters here is the pertinent language from the bill as passed:
NEW SECTION. Sec. 3. A new section is added to chapter 77.32 RCW
5 to read as follows: 6 (1) In addition to a recreational license required under this chapter, a Columbia river salmon and steelhead
stamp or endorsement is required in order for any person fifteen years of age or older to fish recreationally for salmon or steelhead
in the Columbia river and its tributaries where these fisheries
have been authorized by the department.I did not see any language exempting short term licenses from the CR endorsement where applicable although it is at a (minimally) reduced price for 15 year old fishers. If one looks at the license fee matrix on page 6 of the regs there is a separate pricing structure applicable for P.S. crab endorsements to be used with a temporary license. There is no such separate pricing structure cited for annual license/temporary license for the CR endorsement. Draw your own conclusion.