Elevation (ft) 50th to 75th Percentile 25th to 50th Percentile Median Observed /1 11/1 12/1 1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1 Date

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1 Elevation (ft) Bars Indicate 5th and 95th percentiles Lake Koocanusa Elevation - Probability Chart The data presented in this graph are provisional and are intended to provide an estimate of Libby Dam forebay elevation (Lake Koocanusa). For the official short term forecast please refer to the River Forecast Center public site for Libby Dam Forecasts: 75th percentile means that on that day, 75 percent of the traces (forecast scenarios) were below this value. The median points indicate the values such that half of the traces were above and half were below /1 11/1 12/1 1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1

2 80 Libby Dam Inflow- Probability Chart Flow (kcfs) The data presented in this graph are provisional and are intended to provide an estimate of Libby Dam inflow. For the official short term forecast please refer to the River Forecast Center public site for Libby Dam Forecasts: 75th percentile means that on that day, 75 percent of the traces (forecast scenarios) were below this value. The median points indicate the values such that half of the traces were above and half were below. Bars Indicate 5th and 95th percentiles exeedances /1 11/1 12/1 1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1

3 Libby Dam Outflow - Probability Chart The data presented in this graph are provisional and are intended to provide an estimate of Libby Dam outflow. For the official short term forecast please refer to the River Forecast Center public site for Libby Dam Forecasts: 75th percentile means that on that day, 75 percent of the traces (forecast scenarios) were below this value. The median points indicate the values such that half of the traces were above and half were below. Bars Indicate 5th and 95th percentiles exeedances 25 Flow (kcfs) /1 11/1 12/1 1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1

4 Elevation (ft) Libby Dam Reservoir Elevations - Probability Chart The data presented in this graph is provisional and is intended to provide an estimate of elevations of Lake Koocanusa. For the official short term forecast please refer to the River Forecast Center public site for Libby Dam Forecasts: The lines indicate projected elevations for the specified dates. A 30 percent Probability of Exceedance on the June 15th line means that 30 percent of the traces showed the reservoir elevation at or above that level on June 15th. 5/31/2018 6/30/2018 7/31/2018 8/31/2018 Elevation 2454' 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Probability of Exceedence

5 70 Bonners Ferry Stage Elevation (ft) The data presented in this graph are provisional and are intended to provide an estimate of river stages at Bonners Ferry. For the official short term forecast please refer to the River Forecast Center public site for Bonners Ferry forecasts: 75th percentile means that on that day, 75 percent of the traces (forecast scenarios) were below this value. The median points indicate the values such that half of the traces were above and half were below. Flood Stage Bars Indicate 5th and 95th percentiles 30 3/1 4/1 5/1 6/1 7/1 8/1

6 1772 Maximum April-August Bonners Ferry Stage - Probability Chart Bonners Ferry Stage (ft) The data presented in this graph is provisional and is intended to provide an estimate of the maximum river stage at Bonners Ferry. The vertical lines indicate probabilities for the maximum stage this season at Bonners Ferry. For example, the line at 20% intersects with the curve at an elevation which is exceeded in 20% of the traces (model runs). A flat tail indicates that many runs have forecast peaks lower than an already observed peak. The River Forecast Center public site for Bonners Ferry Forecasts is: Maximum Bonners Ferry Elevation Flood Stage % 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Probability of Exceedence

Elevation (ft) 50th to 75th Percentile 25th to 50th Percentile Median Observed

Elevation (ft) 50th to 75th Percentile 25th to 50th Percentile Median Observed 2470 Lake Koocanusa Elevation - Probability Chart Elevation (ft) 2460 2450 2440 2430 2420 2410 2400 2390 2380 2370 2360 2350 2340 2330 2320 2310 2300 The data presented in this graph are provisional and