Structures were installed in Seven Mile Creek to create deeper pools and reduce streambank erosion.

Cross Vane
A cross vane is made up of a set of upstream angled lines of boulders, connected by a section of smaller rocks upstream. While water usually covers the shorter section during normal flows, the taller sections deflect flow away from the banks of the stream. Flow is diverted over the rock walls and concentrated down the center of the channel. The scouring associated with high flow velocities in the center of the channel and the "waterfalling" over the structure itself creates a deep, elongated pool.

J-Hook Vane
A J-hook vane is an upstream pointing line of rocks that originates at one bank and terminates somewhere in the middle of the stream. The most upstream portion of the structure bends back on itself, like a "J," curving into the middle of the channel. This bent portion serves to concentrate flow and scour out a pool while the length closer to the shore deflects flow away from the bank.

Where a cross vane incorporates two structures on opposite banks cooperating to control flow, J-hook vanes are often constructed in series on the same bank. This technique was implemented in the Seven Mile Creek rehabilitation project to protect a bridge embankment from being eroded.