Arrowrock Reservoir water level today
Reservoir in Boise, Idaho · Boise River Snake River
3,132.65ft
954.83 m · NGVD29
Measured · provisional
Normal for the date
What this means
It is lower than on Oct 21 in 7 of the last 10 years.
The lake has risen 3.87 ft in 7 days and risen 2.74 ft in 30 days.
Since 1990, the lowest daily level was 1,513.18 ft (Sep 2003) and the highest 3,217.16 ft (Jul 1995).
Arrowrock Reservoir level chart
Loading chart…
Measured
Normal range for the date (middle 50% of past years)
Same date in past years
| Date | Level | vs today |
|---|---|---|
| Oct 21, 2025 | 3,134.73 ft | ▲ 2.08 ft |
| Oct 21, 2024 | 3,088.32 ft | ▼ 44.33 ft |
| Oct 21, 2023 | 3,141.79 ft | ▲ 9.14 ft |
| Oct 21, 2022 | 3,116.27 ft | ▼ 16.38 ft |
| Oct 21, 2021 | 3,117.57 ft | ▼ 15.08 ft |
| Oct 19, 2020 | 3,137.77 ft | ▲ 5.12 ft |
| Oct 21, 2019 | 3,137.17 ft | ▲ 4.52 ft |
| Oct 21, 2018 | 3,133.64 ft | ▲ 0.99 ft |
| Oct 21, 2017 | 3,170.97 ft | ▲ 38.32 ft |
| Oct 21, 2016 | 3,138.43 ft | ▲ 5.78 ft |
Records & details
- Highest
- 3,217.16 ft on Jul 11, 1995
- Lowest
- 1,513.18 ft on Sep 6, 2003
- Records from
- 1990 (37 years of daily data)
- Inflow
- 648 cfs (18.4 m³/s)
- Outflow
- 378 cfs (10.7 m³/s)
- Water temperature
- Not measured here
Weather & wind
This Afternoon77°F · Mostly Sunny
Wind S 7 mph
Wind S 7 mph
Tonight47°F · Partly Cloudy
Wind SE 7 mph
Wind SE 7 mph
Thursday75°F · Rain Showers
Wind SE 6 to 13 mph
Wind SE 6 to 13 mph
Thursday Night42°F · Showers And Thunderstorms
Wind S 6 mph
Wind S 6 mph
Friday53°F · Rain Showers
Wind WSW 7 to 13 mph
Wind WSW 7 to 13 mph
Friday Night30°F · Mostly Clear
Wind W 3 to 12 mph
Wind W 3 to 12 mph
NOAA National Weather Service forecast for this lake's location, updated 1 h ago.