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South Fork Tolt Reservoir water level today

Lake in King County, Washington

1,720.79ft
524.50 m · NGVD29
Measured · provisional
Much below normal for the dateFallingNOAA: NWS observation not current
24 hours
▼ 0.31 ft
7 days
▼ 2.34 ft
30 days
▼ 7.91 ft
Normal for Oct 23 ?
1,740.14 ft

At a glance · Oct 23

Much lower than usual

South Fork Tolt Reservoir is 19.4 ft lower than normal for Oct 23, lower than on this date in all of the last 10 years.

  • This week↘ Falling 2.34 ft
  • Lowest on record↓ 1,711.77 ft (2003)

Compared with this gauge's own records for the same date. A statistical guide, not advice.

Normal for Oct 23Record lowToday1,720.79 ft

Today compared with past years on Oct 23

Lowest to highest on this date: 1,713.35–1,756.23 ftUsual range (10th–90th percentile): 1,725.71–1,749.99 ftNormal (25th–75th percentile): 1,733.34–1,746.35 ftToday: 1,720.79 ftToday 1,720.79 ftMedian 1,740.14Lowest 1,713.35Highest 1,756.2325th75th
Lowest to highest on this date: 1,713.35–1,756.23 ftUsual range (10th–90th percentile): 1,725.71–1,749.99 ftNormal (25th–75th percentile): 1,733.34–1,746.35 ftToday: 1,720.79 ftToday 1,720.79 ftMedian 1,740.14Lowest 1,713.3525th75th

Where today's reading sits among this gauge's own records for the same date (±3 days). A statistical guide, not advice.

What this means

It is lower than on Oct 23 in every one of the last 10 years on record.

The lake has fallen 2.34 ft in 7 days and fallen 7.91 ft in 30 days.

Since 1991, the lowest daily level was 1,711.77 ft (Oct 2003) and the highest 1,766.54 ft (May 2008).

South Fork Tolt Reservoir level chart

Loading chart…

Measured Normal range for the date (middle 50% of past years)

2026 compared with 2025

1,7181,7301,7431,7561,769JanFebMarAprMayJunJulAugSepOctNovDec202520262025-09-17: 1,732.09 ft2025-09-22: 1,730.35 ft2025-09-27: 1,728.58 ft2025-10-02: 1,727.17 ft2025-10-07: 1,725.48 ft2025-10-12: 1,724.47 ft2025-10-17: 1,723.03 ft2025-10-22: 1,723.82 ft2025-10-27: 1,724.63 ft2025-11-01: 1,727.99 ft2025-11-06: 1,730.46 ft2025-11-11: 1,731.32 ft2025-11-16: 1,737.07 ft2025-11-21: 1,737.59 ft2025-11-26: 1,738.72 ft2025-12-01: 1,739.10 ft2025-12-06: 1,739.99 ft2025-12-11: 1,754.43 ft2025-12-16: 1,756.98 ft2025-12-21: 1,759.33 ft2025-12-26: 1,758.93 ft2025-12-31: 1,758.25 ft2026-01-05: 1,758.36 ft2026-01-10: 1,757.20 ft2026-01-15: 1,757.74 ft2026-01-20: 1,757.07 ft2026-01-25: 1,756.13 ft2026-01-30: 1,756.59 ft2026-02-04: 1,757.58 ft2026-02-09: 1,757.12 ft2026-02-14: 1,756.67 ft2026-02-19: 1,756.16 ft2026-02-24: 1,755.70 ft2026-03-01: 1,755.06 ft2026-03-06: 1,756.03 ft2026-03-11: 1,758.72 ft2026-03-16: 1,758.89 ft2026-03-21: 1,763.33 ft2026-03-26: 1,762.19 ft2026-03-31: 1,761.33 ft2026-04-05: 1,761.41 ft2026-04-10: 1,761.27 ft2026-04-15: 1,761.86 ft2026-04-20: 1,762.20 ft2026-04-25: 1,762.97 ft2026-04-30: 1,762.65 ft2026-05-05: 1,762.28 ft2026-05-10: 1,761.63 ft2026-05-15: 1,761.62 ft2026-05-20: 1,761.59 ft2026-05-25: 1,760.86 ft2026-05-30: 1,760.08 ft2026-06-04: 1,759.20 ft2026-06-09: 1,759.42 ft2026-06-14: 1,759.21 ft2026-06-19: 1,758.05 ft2026-06-24: 1,756.73 ft2026-06-29: 1,755.74 ft2026-07-04: 1,754.81 ft2026-07-09: 1,753.43 ft2026-07-14: 1,751.92 ft2026-07-19: 1,750.42 ft2026-07-24: 1,748.75 ft2026-07-29: 1,747.07 ft2026-08-03: 1,745.42 ft2026-08-08: 1,743.62 ft2026-08-13: 1,741.85 ft2026-08-18: 1,740.15 ft2026-08-23: 1,738.34 ft2026-08-28: 1,736.55 ft2026-09-02: 1,735.07 ft2026-09-07: 1,733.51 ft2026-09-12: 1,731.85 ft2026-09-17: 1,730.60 ft2026-09-22: 1,729.05 ft2026-09-27: 1,727.96 ft2026-10-02: 1,727.33 ft2026-10-07: 1,725.72 ft2026-10-12: 1,724.37 ft2026-10-17: 1,722.68 ft
1,7181,7301,7431,7561,769JanAprJulOct202520262025-09-17: 1,732.09 ft2025-09-22: 1,730.35 ft2025-09-27: 1,728.58 ft2025-10-02: 1,727.17 ft2025-10-07: 1,725.48 ft2025-10-12: 1,724.47 ft2025-10-17: 1,723.03 ft2025-10-22: 1,723.82 ft2025-10-27: 1,724.63 ft2025-11-01: 1,727.99 ft2025-11-06: 1,730.46 ft2025-11-11: 1,731.32 ft2025-11-16: 1,737.07 ft2025-11-21: 1,737.59 ft2025-11-26: 1,738.72 ft2025-12-01: 1,739.10 ft2025-12-06: 1,739.99 ft2025-12-11: 1,754.43 ft2025-12-16: 1,756.98 ft2025-12-21: 1,759.33 ft2025-12-26: 1,758.93 ft2025-12-31: 1,758.25 ft2026-01-05: 1,758.36 ft2026-01-10: 1,757.20 ft2026-01-15: 1,757.74 ft2026-01-20: 1,757.07 ft2026-01-25: 1,756.13 ft2026-01-30: 1,756.59 ft2026-02-04: 1,757.58 ft2026-02-09: 1,757.12 ft2026-02-14: 1,756.67 ft2026-02-19: 1,756.16 ft2026-02-24: 1,755.70 ft2026-03-01: 1,755.06 ft2026-03-06: 1,756.03 ft2026-03-11: 1,758.72 ft2026-03-16: 1,758.89 ft2026-03-21: 1,763.33 ft2026-03-26: 1,762.19 ft2026-03-31: 1,761.33 ft2026-04-05: 1,761.41 ft2026-04-10: 1,761.27 ft2026-04-15: 1,761.86 ft2026-04-20: 1,762.20 ft2026-04-25: 1,762.97 ft2026-04-30: 1,762.65 ft2026-05-05: 1,762.28 ft2026-05-10: 1,761.63 ft2026-05-15: 1,761.62 ft2026-05-20: 1,761.59 ft2026-05-25: 1,760.86 ft2026-05-30: 1,760.08 ft2026-06-04: 1,759.20 ft2026-06-09: 1,759.42 ft2026-06-14: 1,759.21 ft2026-06-19: 1,758.05 ft2026-06-24: 1,756.73 ft2026-06-29: 1,755.74 ft2026-07-04: 1,754.81 ft2026-07-09: 1,753.43 ft2026-07-14: 1,751.92 ft2026-07-19: 1,750.42 ft2026-07-24: 1,748.75 ft2026-07-29: 1,747.07 ft2026-08-03: 1,745.42 ft2026-08-08: 1,743.62 ft2026-08-13: 1,741.85 ft2026-08-18: 1,740.15 ft2026-08-23: 1,738.34 ft2026-08-28: 1,736.55 ft2026-09-02: 1,735.07 ft2026-09-07: 1,733.51 ft2026-09-12: 1,731.85 ft2026-09-17: 1,730.60 ft2026-09-22: 1,729.05 ft2026-09-27: 1,727.96 ft2026-10-02: 1,727.33 ft2026-10-07: 1,725.72 ft2026-10-12: 1,724.37 ft2026-10-17: 1,722.68 ft
20262025Normal (middle 50% of past years)Usual range (10th–90th percentile)Median

Each year drawn on the same January–December axis, over this gauge's normal range for each date. Hover or tap a point for its value.

Same date in past years

DateLevelvs today
Oct 23, 20251,723.53 ft▲ 2.74 ft
Oct 23, 20241,740.38 ft▲ 19.59 ft
Oct 23, 20231,721.05 ft▲ 0.26 ft
Oct 23, 20221,726.68 ft▲ 5.89 ft
Oct 23, 20211,736.67 ft▲ 15.88 ft
Oct 23, 20201,752.41 ft▲ 31.62 ft
Oct 23, 20191,741.65 ft▲ 20.86 ft
Oct 23, 20181,725.30 ft▲ 4.51 ft
Oct 23, 20171,738.75 ft▲ 17.96 ft
Oct 23, 20161,746.97 ft▲ 26.18 ft

Records & details

Highest
1,766.54 ft on May 20, 2008
Lowest
1,711.77 ft on Oct 12, 2003
Records from
1991 (35 years of daily data)
Water temperature
Not measured here

Full history: yearly highs and lows, monthly averages →

Tolt River - South Fork

Height
200 ft
Completed
1962
Purposes
Water Supply; Hydroelectric
Owner
City of Seattle
Normal storage
57,500 acre-ft
Surface area
1,040 acres

National Inventory of Dams (U.S. Army Corps of Engineers). All dam facts →

Weather & wind

Overnight36°F · Mostly Cloudy
Wind W 2 mph
Friday44°F · Mostly Sunny
Wind W 5 mph
Friday Night36°F · Mostly Clear
Wind E 1 to 7 mph
Saturday49°F · Mostly Cloudy then Slight Chance Light Rain
Wind SSE 2 to 6 mph
Saturday Night41°F · Chance Light Rain
Wind E 3 to 9 mph
Sunday49°F · Chance Light Rain
Wind ESE 2 to 9 mph

NOAA National Weather Service forecast for this lake's location, updated 9 h ago.

Flood information

NOAA: NWS observation not current

Flood status comes from the NOAA National Weather Service. We do not issue warnings. Flood stages explained. For official forecasts and warnings, see the NOAA gauge page.

Nearby lakes

All Washington lake levels →