yes, there are strict guidelines for the testing and closures (domoic acid, for example, one bad test results in a closure and it then takes 2 consecutive good tests to reopen). I suggest getting e-mail alerts by signing up at the webpage that C_Run posted. they will e-mail you an update whenever there is a change (more closed area or more opened area), ODFW also provides alerts if you sign up for Marine Zone updates. The Oregon Dept. of Agriculture website, if you scroll down, has PDF tables of the actual test results.
sorry I didn't get to reply sooner, Pepper got some 'OFF-leash' time this morning while I was wandering around on a remote beach that we had all to ourselves...one of us is exhausted. (hint: it isn't me)...