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Rock River above Sinnissippi Dam at Rock Falls water level

River gauge, Rock River, Illinois, United States

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Right now

Very high for mid-October

Water level

6.59ft Down 0.07 ft over the last 24 hours

6.0 6.2 6.5

History

History
6.06.36.56.8ftOct 16Oct 17Oct 18Oct 19Oct 206.06.36.56.8ftOct 16Oct 18Oct 20
6.06.57.0ftSep 21Sep 28Oct 5Oct 13Oct 206.06.57.0ftSep 21Oct 5Oct 20
567ftOct 2025Jan 2026Apr 2026Jul 2026Oct 2026567ftOct 2025Apr 2026Oct 2026
567ftJanMarMayJulSepNov2026567ftJanAprJulOct2026

20252026

Water level Normal range (10–90 %)

What this means

The gauge at Rock River above Sinnissippi Dam at Rock Falls shows 6.59 ft, well above normal for mid-October.

The median for mid-October is 6.26 ft, based on 22 years of readings, so the river stage is 0.33 ft above typical. On the same day last year the reading was 6.42 ft, a difference of +0.17 ft.

The level is falling, down 0.07 ft over the past 24 hours. Over the past 30 days it has moved between 6.38 ft and 6.94 ft.

That stands out in fall, when many rivers are usually near their lowest.

Compared with 22 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
6.26 ft0.33 ft above the median for this date
Normal for this date
6.00 ft – 6.50 ft8 years in 10 fall in this range (22 years of records)
Same day last year
6.42 ft+0.17 ft
Lowest and highest in 30 days
6.38 ft – 6.94 ft
Lowest and highest in 12 months
5.55 ft – 7.08 ft

High water at Rock River above Sinnissippi Dam at Rock Falls

The National Weather Service splits flooding into minor, moderate and major flood stage, each tied to what starts to go under water at this particular gauge. Minor flooding usually means low roads, parks and farmland; major flooding reaches homes and businesses.

Keep children and dogs well back from the edge, and stay off flooded footpaths and towpaths.

Weather at the gauge

No rain in the last 3 days.

20 Tue 68° 39° – Wind 6 mph
21 Wed 70° 42° – Wind 5 mph
22 Thu 70° 53° – Wind 6 mph
23 Fri 71° 53° – Wind 10 mph
24 Sat 72° 55° – Wind 14 mph
25 Sun 70° 55° – Wind 11 mph
26 Mon 62° 39° 0.25 in Wind 15 mph

Forecast: Open-Meteo

Sunrise 07:17 AM Sunset 06:11 PM Daylight 10 hr, 54 min First quarter 69%

Map

Other gauges on the Rock River

Gauge Level Compared with normal 24 hours Distance
Rock River at JeffersonRiver gauge, Rock River 4.78 ft Below flood stage +0.02 ft 95 mi
Rock River at Fort AtkinsonRiver gauge, Rock River 11.52 ft Below flood stage ±0 90 mi
Rock River at NewvilleRiver gauge, Rock River 2.71 ft Below flood stage +0.04 ft 79 mi
Rock River at AftonRiver gauge, Rock River 5.05 ft Below flood stage −0.40 ft 65 mi
Rock River at RocktonRiver gauge, Rock River 5.04 ft High −0.17 ft 55 mi
Rock River at Latham ParkRiver gauge, Rock River 5.20 ft Normal −0.09 ft 51 mi
Rock River at Auburn St at RockfordRiver gauge, Rock River 3.17 ft Normal −0.05 ft 47 mi
Rock River above Dam at RockfordRiver gauge, Rock River 2.62 ft High −0.12 ft 45 mi
Rock River at ByronRiver gauge, Rock River 7.10 ft Normal −0.05 ft 32 mi
Rock River at DixonRiver gauge, Rock River 9.38 ft Normal −0.09 ft 11 mi
Rock River at ComoRiver gauge, Rock River 5.13 ft Below flood stage −0.06 ft 3.7 mi
Rock River near JoslinRiver gauge, Rock River 7.30 ft Normal −0.01 ft 31 mi

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Elkhorn Creek near PenroseRiver gauge, Elkhorn Creek 3.26 ft High −0.01 ft 8 mi
Mississippi River at Dam 13 near FultonRiver gauge, Mississippi River 5.00 ft Below flood stage +0.08 ft 26 mi
Mississippi River at ClintonRiver gauge, Mississippi River 9.49 ft Below flood stage −0.04 ft 30 mi
Big Bureau Creek at PrincetonRiver gauge, Big Bureau Creek 3.15 ft Very high −0.02 ft 30 mi
Green River near GeneseoRiver gauge, Green River 4.68 ft High −0.13 ft 32 mi
Pecatonica River at FreeportRiver gauge, Pecatonica River 5.83 ft Normal −0.21 ft 36 mi

Questions and answers

Is the Rock River above Sinnissippi Dam at Rock Falls higher than last year?

Yes, it is 0.17 ft higher than on the same day last year, when the reading was 6.42 ft.

What is a normal level for the Rock River above Sinnissippi Dam at Rock Falls in mid-October?

The median for mid-October is 6.26 ft. In 8 years out of 10 the reading falls between 6.00 ft and 6.50 ft, based on 22 years of records.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Rock River above Sinnissippi Dam at Rock Falls today?

On Oct 20, 2026, 08:30 AM CDT, the water level was 6.59 ft. Down 0.07 ft over the last 24 hours.

Is Rock River above Sinnissippi Dam at Rock Falls rising or falling?

Down 0.07 ft over the last 24 hours. Down 0.18 ft over the last 7 days.

Is the level of Rock River above Sinnissippi Dam at Rock Falls normal?

Very high for mid-October. Compared with 22 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Geological Survey
Station code
usgs:05443000 (Agency page)
Coordinates
41.78717, -89.67708 (WGS84)
Vertical datum
NAVD88
Update interval
every 15 minutes
Licence
Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Water level 6.59 ft 2026-10-20 13:30 Provisional

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How to cite

U.S. Geological Survey: Rock River above Sinnissippi Dam at Rock Falls (usgs:05443000). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/illinois/rock-river-above-sinnissippi-dam-at-rock-falls

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.