The Waimamaku River at the Wekawaka road bridge is just off State Highway 12 close to the township of Waimamaku in the Hokianga. It is a pleasant bouldery river with stony beaches and is a popular
swimming spot. The catchment is dominated by native forest in the upper reaches and is mainly pastoral in the lower catchment. Bacteria levels are slightly elevated and are a result of farm rainfall-runoff, and livestock access to waterways.