Pond Permits in Oregon and Washington

I'm looking into the process for putting in some ponds at sites I have access to in Oregon and Washington. I keep hearing and reading wildly inconsistent things from different people, including government officials. Does anyone have any advice? One told me I wouldn't need a permit for under 90 cubic yards. Another said that I have to send in a detailed site map drawn to scale, A permaculture farmer and swale builder told me I don't need a permit if I contact the National Resource Conservation Service.

Any help or advice would be appreciated.

My experience with NRCS projects is that any permit is ALSO needed - they don't overrule anything with that.  In general, you must please EVERY commanding body, not just one.

90 cu meters is not much for a pond -- your should clarify if that is "per year" like most drainage and earthworks projects are regulated.  Then by year 5 you can have a nice little pond...