Arrowrock Reservoir lake and shoreline

Arrowrock Reservoir Water Level

Idaho

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Arrowrock Reservoir is currently at a water-surface elevation of 3126.3 feet.

3126.30 ft · Updated 21 hours ago · USACE NWW District

Current level

3,126.3ft

Status unavailable

A verified operating range is not available for this lake.

Since last reading

Up 0.57 ft

Previous readingSep 93,125.73 ft

7-day change

Up 0.71 ft

7-day trend: Rising

5 daily readings in the last 7 days

30-day change

Up 0.71 ft

5 daily readings in the last 30 days

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Water Level History

Elevation (ft) Water-surface elevation (ft)

3126 ft3126 ft3126 ftSep 7Sep 11

Level status

Summary updating

This comparison needs the current level and full pool. We use the live feed when present, otherwise the latest daily summary when it includes a pool comparison.

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

No published reference elevations for this lake.

Watershed drought

Abnormally Dry

19.7% of watershed in official drought (D1+).

Severity

NoneExtreme
Trend
Improving

Watershed drought conditions

Boise County, ID

Abnormally Dry

Abnormally Dry. The surrounding county is abnormally dry, which is not official drought.. Trend: Improving compared with last week. Official drought yes

Severity

NoneExtreme

Weekly trend

Improving

Compared with last week

Official drought

Yes

19.7% of the watershed is currently classified as official drought (D1+).

U.S. Drought Monitor · map date Sep 8, 2026. Updated weekly. droughtmonitor.unl.eduView drought map for Boise County, ID

Daily level summary

  • Sep 10, 2026

    3,126.3 ft

    +0.57 ft

  • Sep 9, 2026

    3,125.73 ft

    +0.27 ft

  • Sep 8, 2026

    3,125.46 ft

    -0.06 ft

  • Sep 7, 2026

    3,125.52 ft

    -0.07 ft

  • Sep 6, 2026

    3,125.59 ft

    —

Common questions about Arrowrock Reservoir’s water level

  • The current water level at Arrowrock Reservoir is 3,126.3 ft (updated 21 hours ago). You can track the Arrowrock Reservoir lake level on the interactive chart and daily history above.

  • The current 7-day trend for the Arrowrock Reservoir lake level is rising — rising about 0.71 ft over the past week. See the history chart above for the full picture.

  • Readings refresh when USACE NWW District publishes new gauge data — typically daily for most reservoirs. The timestamp above the chart shows when the latest observation arrived on Lake Insights.

Lake level glossary

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

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