The N. Santiam is CLOSED to ALL Chinook fishing; until Nov. 1st.
The Mainstem is open all year for Coho.
The N. Santiam is open--up to the Stayton/Scio bridge all year, for Coho.
The N. Santiam is currently closed; will also re-open on Nov. 1, for Coho too (above the Stayton/Scio bridge).
FYI, all of this information is available in the Oregon reg book--or online on ODFW's web site (and the law expects that you know this information, BEFORE you venture out).