Whau Valley Reservoir is a reservoir in Whangarei.
The reservoir is attached to the Whau Valley Water Treatment Plant, which supplies all reservoirs in Whangarei with water. The reservoir can hold 1,871,286 cubic meters of water, a maximum reached in 2024 despite low rainfall. While boats on the water aren't allowed, the public can fish from the sides of the reservoir.[1] The lake is populated annually with 300 rainbow trout.[2]