Answer: midstream

AnswerCrossword Clue
MIDSTREAM

No horse-changing place

MIDSTREAM

While underway

MIDSTREAM

Center line of a sort.

MIDSTREAM
Bad place to change horses.
MIDSTREAM
Current location?
MIDSTREAMPerfectly halfway from either bank
MIDSTREAMIn the thick of things
MIDSTREAMIn the channel, often