"The earth silvers like a river we're in"

The American Public Media show "Weekend America" this weekend features an account of the flood and reflections on nature by James Galvin, poet and faculty member at the Iowa Writers' Workshop, including his poem "Testimony":

You can't step into the same
River even once,
And why would you want to? You can't
Lie down without turning your back
On someone. The sun slips
Like butter in a pan.

The eastern sky arrives
On the back stoop in its dark
Suit. It draws itself up
Full height to present its double
Rainbow like an armful of flowers.
Thank you, they're lovely.

I step outside where the wind
Lifts my hair and it's just
Beginning to rain in the sun,
And the earth silvers like a river
We're in, I swear to God,
And you can't step out of a river

Either. Not once.