Just before the snow melts and transforms small streams to rushing torrents, the OBMEP team must have all PIT tag interrogation equipment in position to monitor adult steelhead as they travel upstream to their desired spawning habitats. When stream flows increase to their peaks, the monitoring equipment must be able to withstand the debris and erosion experienced during a high snowpack year. The OBMEP team is on hand to measure peak stream flow events as real-time stream gaging efforts depend upon high flow measurements for the most accurate discharge information. In March, adult steelhead begin to travel upstream through the sometimes turbid, sometimes clear waters of the tributaries to the Okanogan River. The OBMEP team wait for the adult steelhead to arrive in the tributaries and then begin weekly surveys to document the locations and numbers of steelhead redds, or nests, where they lay their eggs.