The Denver Athletic Club has a nice indoor lap pool. I do not know if they allow day passes. If you can make the short drive to Denver University, it has a great aquatics center and a very good masters program.

Carla Madison rec center is great. $6 day pass.

The 20th St Indoor pool is 4 lanesx20 yards and while not fancy, is rarely used and very close to the convention center.

https://www.denvergov.org/content/denvergov/en/denver-parks-and-recreation/recreation-centers-pools/recreation-centers-schedules/twentieth-street-recreation-center.html

any year-round outdoor pools in downtown Denver?

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I believe the closest is the Cherry Creek Athletic Club in Cherry Creek, about 4-5 miles from downtown. And they have a temp cutoff of an expected high temp of 34 to be open.