Foote, in your particular case, as long as you are past Morgan it will be OK. The river is in the city limits from where it ends on Dallas Ave to the other side of the bridge. If you step foot on the other side of the river however, you are out of the city limits.

It is illegal to discharge a firearm in the City limits.

Reckless Engangerment charges could also apply if it were shown that your actions created a substatial risk to someone else i.e. shooting towards them or an occupied residence. This is where common sense factors apply.