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In page Splash dam:

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By impounding water and allowing it to be released on the log drive's schedule, these dams allowed many more logs to be brought to market than the natural flow of the creek allowed. Water releases from multiple splash dams on tributaries were also often combined to maximize the number of logs floated throughout a given watershed. On the Red River in eastern Kentucky, a series of carefully timed releases of water from splash dams allowed log drives to travel 20 miles (32 km) downstream. These drives had between 35,000 and 50,000 logs in them and one produced a log jam 1 mile (1.6 km) long.[4]