Last reading · NGVD29
Keystone Lake Water Level Today
The last reading for Keystone Lake, the Arkansas River reservoir behind Keystone Dam, was 720.90 ft (NGVD29) on Oct 17, 2026. That's 2.10 ft below its top of conservation pool of 723.00 ft. Keystone Lake is 4.71 ft lower than on the same date last year.
−2.10 ft
Below full pool
720.90 ft
Oct 17, 2026 CDT
- 7-day change+0.49 ftOct 10, 2026
- 30-day change−1.00 ftSep 17, 2026
- Vs last year−4.71 ftOct 17, 2025
- ReadingOct 17, 2026720.90 ft
Is Keystone Lake Full?
No. Keystone Lake is 2.10 ft below its top of conservation pool of 723.00 ft. On Oct 17, 2026, the elevation was 720.90 ft (NGVD29 datum). Over the 30 days ending Oct 17, 2026, Keystone Lake has fallen 1.00 ft. The mean for this calendar day across 11 earlier years (2015–2025) is 724.87 ft, and the latest reading is 3.97 ft below it.
Keystone Lake Level vs Last Year & Historical Average
Comparisons for Keystone Lake use the same NGVD29 series as the chart. The series begins Sep 30, 2015 and has 4034 daily values. Keystone Lake is 4.71 ft lower than on the same date last year. In that window, the lowest daily level was 717.63 ft on Nov 22, 2022, and the highest was 757.11 ft on May 28, 2019.
| Mark | Date | Elevation | Vs latest |
|---|---|---|---|
| Latest reading | Oct 17, 2026 | 720.90 ft | — |
| 7 days earlier | Oct 10, 2026 | 720.41 ft | +0.49 ft |
| 30 days earlier | Sep 17, 2026 | 721.90 ft | −1.00 ft |
| 1 year earlier | Oct 17, 2025 | 725.61 ft | −4.71 ft |
| Same-day mean (11 years) | — | 724.87 ft | −3.97 ft |
Keystone Lake Water Level Chart
Daily elevation Full pool (top of conservation pool) Latest
Full pool (top of conservation pool): 723.00 ft (above the chart's range).
| Start | End | Low | High | Days |
|---|---|---|---|---|
| Sep 18, 2026 | Oct 17, 2026 | 720.09 ft | 721.82 ft | 30 |
Full pool (top of conservation pool): 723.00 ft.
| Start | End | Low | High | Days |
|---|---|---|---|---|
| Oct 17, 2025 | Oct 17, 2026 | 720.09 ft | 740.86 ft | 365 |
Full pool (top of conservation pool): 723.00 ft.
| Start | End | Low | High | Days |
|---|---|---|---|---|
| Oct 19, 2016 | Oct 17, 2026 | 717.63 ft | 757.11 ft | 3650 |
Monthly High, Low, and Average
Each row is the high, low, and average of the daily Keystone Lake elevations in that month (Oct 2025 through Oct 2026). The lowest monthly average in this table is Oct 2026 at 720.55 ft (17 days). The highest monthly average is Jul 2026 at 730.72 ft.
| Month | High | Low | Average |
|---|---|---|---|
| Oct 2025 | 726.70 | 723.99 | 725.51 |
| Nov 2025 | 725.36 | 722.68 | 724.15 |
| Dec 2025 | 726.07 | 723.70 | 725.06 |
| Jan 2026 | 723.79 | 722.11 | 722.98 |
| Feb 2026 | 725.28 | 722.21 | 723.26 |
| Mar 2026 | 726.90 | 723.49 | 725.33 |
| Apr 2026 | 727.02 | 724.34 | 725.63 |
| May 2026 | 726.10 | 724.10 | 724.99 |
| Jun 2026 | 740.74 | 725.78 | 730.58 |
| Jul 2026 | 740.86 | 724.15 | 730.72 |
| Aug 2026 | 726.03 | 723.18 | 724.82 |
| Sep 2026 | 723.01 | 720.85 | 721.81 |
| Oct 2026 | 721.00 | 720.09 | 720.55 |
About This Data
| Agency | U.S. Army Corps of Engineers |
|---|---|
| Time series | Keystone Lake (SWT:KEYS.Elev.Inst.1Hour.0.Ccp-Rev) |
| Parameter | CWMS KEYS.Elev, hourly, feet |
| Datum | NGVD29 |
| Formula | USACE CWMS native datum NGVD29. |
| Full pool | Full pool (top of conservation pool): 723.00 ft |
| Full-pool source | https://cwms-data.usace.army.mil/cwms-data/levels?office=SWT&name=KEYS.Elev.Inst.0.Top+of+Conservation&page-size=20 |
| Latest reading | Oct 17, 2026 CDT (2026-10-17 13:00 UTC) |
| Series file | data/raw/keystone-lake/cwms-0-20261017T132852Z.json, data/raw/keystone-lake/cwms-1-20261017T132852Z.json, data/raw/keystone-lake/cwms-location-20261017T132852Z.json, data/raw/keystone-lake/cwms-level-20261017T132852Z.json |
| Note | Provisional data, subject to revision. |
How We Calculate These Numbers
Daily history for Keystone Lake uses one USACE CWMS hourly elevation per local day. For Keystone Lake, full pool (top of conservation pool) is 723.00 ft. The difference on Oct 17, 2026 is −2.10 ft (720.90 minus 723.00). The same-day mean at Keystone Lake uses 11 readings on this calendar day from 2015 through 2025 and equals 724.87 ft. All of these figures come from USACE CWMS time series SWT:KEYS.Elev.Inst.1Hour.0.Ccp-Rev. Percent full is shown only when an agency published it; it is never estimated by dividing elevation by a pool elevation.
FAQ
Is Keystone Lake full?
No. On Oct 17, 2026, Keystone Lake was 720.90 ft, 2.10 ft below its top of conservation pool of 723.00 ft.
What is full pool at Keystone Lake?
Full pool at Keystone Lake is 723.00 ft (NGVD29). On Oct 17, 2026, the lake was 2.10 ft below it. The source is linked under About This Data.
Is Keystone Lake higher than last year?
No, Keystone Lake is lower than last year. On Oct 17, 2025 it was 725.61 ft; on Oct 17, 2026 it is 720.90 ft (−4.71 ft).
Where does the Keystone Lake data come from?
USACE CWMS time series SWT:KEYS.Elev.Inst.1Hour.0.Ccp-Rev, CWMS KEYS.Elev, hourly, feet. The datum is NGVD29. Provisional data are subject to revision.
Nearby Lakes
| Lake | Level | Reading | Distance |
|---|---|---|---|
| Table Rock Lake | 910.82 ft | Oct 17, 2026 | 166 mi |
| Bull Shoals Lake | 653.42 ft | Oct 17, 2026 | 205 mi |
| Toledo Bend Reservoir | 167.87 ft | Oct 17, 2026 | 354 mi |
| Canyon Lake | 907.71 ft | Oct 17, 2026 | 448 mi |