Discrete water samples data are undergoing modernization with this page no longer being updated with the latest data
starting March 11, 2024
with a full decommission expected 6 months later.
Learn more about the upcoming change and where to find the new samples
data in our blog.
USGS 452333122460100 TUALATIN RIVER UPSTRM RM 9.4 RIFFLE, NR DURHAM, OR