Willamette Valley, lawn watering recommendations
You should have received a basic care sheet from the sod supplier which genearlly provide adquate guideline.
You might contact your local water utilities company as some email a weekly "How much should I water?" message to users in their district. Each water district will base their suggestion on local conditions.
In most instances, you can visit the the utility's website to register for such notifications.
Another option is to review the information in "Practical lawn care for western Oregon" - https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/ec1521.pdf