Arrowrock Reservoir lake and shoreline

Arrowrock Reservoir Water Level

Idaho

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Arrowrock Reservoir

Arrowrock Reservoir is currently 80.5 feet below full pool, with a water-surface elevation of 3135.5 feet.

3135.51 ft · Updated 1 day ago · USACE NWW District

Current level

3,135.51ft

−80.49 ft vs full pool

Low

Vs full pool

Since last reading

Up 0.89 ft

Previous readingOct 243,134.62 ft

7-day change

Up 3.76 ft

7-day trend: Rising

8 daily readings in the last 7 days

30-day change

Up 6.28 ft

30 daily readings in the last 30 days

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Water Level History

Current
3135.51 ft
24h
+0.89 ft
7d
+3.76 ft
30d
+6.28 ft

Elevation (ft) Water-surface elevation (ft)

Reference line is designed full pool.

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Lake Level Context

Level remains below the full pool

Arrowrock Reservoir is currently 3135.51 ft, 80.49 ft below its full pool. The lake has risen 3.76 ft over the past 7 days and 6.28 ft over the past 30 days.

Arrowrock Reservoir Level Details

Reference elevations, recent daily readings, data sources, and answers to common questions.

Conditions & Reference

Level status

80.49 ft below full pool

Current level
3,135.51 ft
Full pool
3,216 ft
DatumVertical reference for published pool and stage elevations at this lake (from the lake catalog).
Water-surface elevation (ft)
Elevation reference
Not available
Source
USACE NWW District

Reference levels

  • Full pool3,216 ft

Surrounding county drought

Abnormally Dry

17% of surrounding county in official drought (D1–D4).

Severity

NoneExtreme
Trend
Stable

Surrounding county drought

Boise County, ID

Abnormally Dry

Abnormally Dry. The largest share of Boise County, ID is Abnormally Dry (D0). 17% of the county is still in Moderate Drought or worse (D1–D4), which the U.S. Drought Monitor treats as official drought. These figures describe the surrounding county from the lake location, not the lake itself.. Trend: Stable compared with last week. Official drought (D1–D4) yes

Severity

NoneExtreme

Weekly trend

Stable

Compared with last week

Official drought (D1–D4)

Yes

17% of the surrounding county is in official drought categories (D1–D4). Dominant category remains Abnormally Dry.

U.S. Drought Monitor · map date Oct 20, 2026. Updated weekly. Official drought means U.S. Drought Monitor categories D1–D4 (Moderate through Exceptional). Abnormally Dry (D0) is not counted as official drought. droughtmonitor.unl.eduView drought map for Boise County, ID

Daily level summary

DateLevelChange
Oct 25, 20263,135.51+0.89
Oct 24, 20263,134.62+0.91
Oct 23, 20263,133.71+0.83
Oct 22, 20263,132.88+0.07
Oct 21, 20263,132.81+0.16
Oct 20, 20263,132.65+0.24
Oct 19, 20263,132.41+0.66

Common questions about Arrowrock Reservoir’s water level

  • The current water level at Arrowrock Reservoir is 3,135.51 ft (updated 1 day ago). You can track the Arrowrock Reservoir lake level on the interactive chart and daily history above.

  • Full pool for Arrowrock Reservoir is 3,216 ft — the normal conservation target elevation when the reservoir is at its designed summer or operating pool.

  • The current 7-day trend for the Arrowrock Reservoir lake level is rising — rising about 3.76 ft over the past week. See the history chart above for the full picture.

  • Based on the latest gauge reading, Arrowrock Reservoir is currently 80.49 ft below full pool.

Lake level glossary

Definitions for pool targets, datums, and how elevation readings are labeled.

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