Mid-stream

So I was constrained to turn again to the mid-stream.

Source: wiktionary

We steamed easily across the first part of the Tay Bridge, and then after passing over the long spans in mid-stream we coasted smoothly down the 1 in 114 gradient, and around the sweeping curve through Esplanade Station.

Source: wiktionary

The boundary should be demarcated along the mid-stream of the course at the time of the demarcation of that branch of the Fenny River indicated as the Fenny River on Survey of India Map Sheet no 79 M/15.

Source: wiktionary

Starting from the coast at Point Playa, the line of boundary shall run in a straight line to the River Barima at its junction with the River Mururuma, and thence along the mid-stream of the latter river to its source, and from that point to the junction of the River Haiowa with the Amakura, and thence along the mid-stream of the Amakura to its source in the Imataka Ridge,...

Source: wiktionary