Faux Water Feature

One of the blessings of my property is this gully. It cuts deep through the center making for an interesting feature.

I want to place a simple bridge over it that leads to my mediation/memory garden.

Edge it with some Lady Fern and Lily of the Valley plantings.

Then fill in the base with rip rap and Powder Blue Festuca Grass, to simulate a river. Water only flows when it rains really hard or for a long time.