A salmon redd is the name given to the nest a female salmon builds for her eggs. The female will use her tail to dig a small depression on the riverbed and allow the river's currant to carry away excess gravel and sand.

The female salmon will then lay her eggs in the redd and cover them with sand and gravel to protect them.

She will always make her redds upstream from one another to allow the currant to deposit the gravel from the previous redd over the new one, and give it more protection.