So it has been 5 days since I shot at the rat and covered over the tunnels. They remain undisturbed. I've watched, with air rifle ready, for activity at dusk and have seen nothing. The baited and set traps were undisturbed until this morning when I found another chipmunk.
All good signs, right? Unfortunately, my husband said he saw "something" near the pallet deck that "might have been something" that he thought "could have been a rat" in the morning 2 days ago when he let the dogs out. I grilled him on the details but got nothing more. I'm counting this as an unconfirmed sighting.

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...from what I've read...No doubt there...one rat sighted/caught usually means many more somewhere close, and they are sneaky hard to trap SOB's.
Thankfully I've never had to deal with them, just mice in every outbuilding, the grill, and garage under house (only 2 in house in 17 years).
Had a bloom of chipmunks/ground squirrels, and black squirrels, around this spring...but they mostly seem to have dispersed elsewhere.
I live rural and think natural preds keep the numbers down.