It is to understand the pioneers, who had to read river currents and predict weather.

The river current was steady now, and they were making good time.

He might have been struggling against a swollen river current.

Heavy rains in the area often cause strong river currents and flooding.

"What do you figure the speed of the river current?"

Race officials shortened the course by 18 miles because of river currents.

The river current was too swift for a paddle-propelled vehicle.

You can see brown river currents go red, yellow, green.

But even as they managed to escape, the river currents pulled them off.

The river current was doing most of the work.