Cathy samples the Koktuli site every other month to measure water quality and quantity. Data loggers record measurements from pressure transducers in the water every 15 minutes. These transducer measurements are correlated to discharge by hand measurements. In summer Cathy flies PenAir from Anchorage to Dillingham, takes a charter flight to Ekwok, then Luki Akelkok drives her three hours upriver in his jetboat to the gauges. In winter she takes a Jet Ranger helicopter from Dillingham.