Engaging!
The first stanza evokes for me, first, a quick thought of The Crossing of the Bar, by Alfred Lord Tennyson. Then more immediately, the Missouri River as it runs through the Bismarck-Mandan area. My wife and her family grew up on the sandbars in the river. The Missouri was considered a wild river by the steamboat pilots, and the sandbars appeared and disappeared at a rate unheard of on the Mississippi. The sparse, direct, and specific language provides open air which invites such thoughts.
There is a decent argument that the four lines of S.2 should be refashioned into two stanzas of two lines each. There seems to be a natural pause where a stanza break will add drama to the M-dash positioning, and an increased subtle emphasis to the closing couplet.
That leaves the matter of the title. Here, the title will need to anchor the canvas to make this poem. My first impulse is to suggest "Kismet". Remember Sparky's admonition: If you don't have a worthy title then you have not committed to the poem.
So, in sum:
Kismet
The bar at noon
is a long brown river.
No one looks up
when the door opens —
the light is the door,
the door is the light.