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River Flow Planner

Name: Upper Klamath Lake at Rattlesnake Point, OR – daily lake and reservoir level record, 1974–2026 (USGS 11505900)
Creator: U.S. Geological Survey

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Legal disclaimer & use of data

The River Flow Planner tool and the gage records it presents are provided for general informational and planning purposes. Flow, gage-height, and related values are derived from historical daily-mean records published by the U.S. Geological Survey (USGS) and other governmental water resource agencies, and may contain gaps, estimated values, revisions, or errors. Historical data is not a guarantee of current or future conditions, and river flows can change rapidly and without warning due to precipitation, snowmelt, dam operations, and other factors.

River Flow Planner is backward looking statistical tool that can provide information for future planning, not a substitute for real-time monitoring, local knowledge, or the judgment of a qualified professional. Activities in, on, or near flowing water — including fishing, swimming, rafting or other boating, wading or working in-stream, and diverting or withdrawing water — carry inherent risks, including but not limited to drowning, hypothermia, entrapment, entanglement, and property damage. Conditions suitable for one activity, craft, or skill level may be hazardous for another.

Always verify current conditions before entering or working near water, wear appropriate safety equipment (such as a properly fitted personal flotation device), obtain any required permits or water rights before diverting water, and follow all applicable local, state, and federal regulations.

Use at your own risk. The creators, contributors, and distributors of this tool assume no liability for any injury, loss, or damage of any kind arising from reliance on the data or analysis presented here. By clicking “Enter River Flow Planner” below, you acknowledge that you have read and understood this disclaimer and agree to use this tool and its data responsibly and at your own risk.

Collage of Rogue River basin activities the historical flow record can help plan around: fly fishing from a drift boat, whitewater rafting, swimming and picnicking along the riverbank, a water diversion headgate, in-stream excavation work near a river channel, and launching a boat from a lake boat ramp.

I have read and understood the disclaimer above

Set Up The Analysis

The below inputs will define all charts created when the analysis is run.

User Defined Analysis PeriodYour input — the default is the gage period of record.

Future Focus WindowFuture dates of interest for recreation, instream work, etc. Expected normal range of lake elevations based on the user defined analysis period. Maximum of 1 Year of Data

Lake Elevation Range of Interest low and high lake elevation inputs, used to chart when lake elevations within this range are likely or not likely to occur based on the user defined analysis period.

Compare Lake Elevation Dates to Normal Range of Lake ElevationsA specific date range to compare actual daily lake elevation against the 25th/50th/75th percentile normal range, based on the user defined analysis period. Maximum of 1 Year of Data

User Defined Analysis Period Begin date

End date

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Future focus window Start date

End date

75th, 50th, and 25th percentile lake elevations based on user defined analysis period

Lake elevation range of interest Low lake elevation (feet)

High lake elevation (feet)

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Compare lake elevation dates to normal range of lake elevations Start date

End date

75th, 50th, and 25th percentile lake elevations compared against actual daily lake elevation for these dates. Maximum of 1 Year of Data

Results

User Defined Analysis Period

—

Your lake elevation range

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Future window

—

Compare window

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Computed from — days in your analysis period, out of — days of full record.