A trio of whales and other interesting creatures

Here I am at yet another garden I was tipped off to by a friend. A friend who knows how happy it makes me to see other agave lovers doing their thing here in Portland...I took these photos back on January 9th, and unfortunately some are quite blurry. Just pretend the wind is blowing the leaves on those Yucca rostrata.
Hey, look at those lovely creatures!
Although one did have a fin that looked little concerning (get it, fin... because after all Agave ovatifolia is the whale's tongue agave).
I would love to know how old these are, and what size they were when planted.
The same garden's hellstrip...
Agave bracteosa
And another...
Since the neighborhood looked like it had potential, I took a couple random turns before heading on my way, looking left and right, scanning for interesting plants. I was rewarded with this garden and it's gem of an agave. Hellstrip...
And corner of the garden "proper"...
Walking further up the sidewalk I discovered an interesting vignette (in the same garden)...
There was a lot to look at.
Walking back to my car now...

I feel like such an agave loser that I didn't have a firm idea what this is. I had a few guesses but sent a photo to my friend Bryon Jones at the PDZA to see what he thought. He had a couple ideas as well, but sent it on to Greg Starr to see what he thought. Greg says Agave havardiana—so there you have it!
It's certainly happy and healthy and pupping! But a little close to the sidewalk.
Nice work fellow Portland spiky-plant lovers!