Little Sioux River at Linn Grove water level

Name: Little Sioux River at Linn Grove water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Little Sioux River, Iowa, United States

Directions

Below flood stage

Water level

6.48ft Down 0.17 ft over the last 24 hours

Measured Oct 20, 2026, 07:00 PM CDT (1 hour ago)

Flow: 439 cfs

History

7 days

Water level Minor flood stage

What this means

The gauge at Little Sioux River at Linn Grove reads 6.48 ft, a normal level.

It is 10.02 ft below the flood stage of 16.50 ft.

The level is falling, down 0.17 ft over the past 24 hours. Over the past 30 days it has moved between 6.03 ft and 6.82 ft.

Fall is often low-water season on rivers, until steadier rain returns.

Judged against the official flood stage for this gauge. How to read levels

Key numbers

Highest on record: 29.98 ftJune 23, 2024

What the stage means on the water

A normal level is usually prime time for floating and wade fishing, as long as the weather holds upstream.

The National Weather Service puts flood stage for this gauge at 16.50 ft, still 10.02 ft away.

What happens at each level

31.50 ft: Weaver St is flooded in Linn Grove.
29.00 ft: Significant flooding is ongoing in Sioux Rapids as water reaches as far in as 2nd and Main St. Water also reaches the bottom of the bridge on Weaver St in Linn Grove.
28.00 ft: Highway 71 south of the bridge in Sioux Rapids is flooded and at least one house in Linn Grove near the campground may flood.
27.00 ft: The bathroom at the campground in Linn Grove floods.
24.00 ft: Some businesses west of Hwy 71 in Sioux Rapids are in danger of flooding. The low portion of Highway 71 north of the bridge in Sioux Rapids may begin to flood.
22.50 ft: Park St, as well as the northern portion of 1st St in Sioux Rapids begin to flood.
21.00 ft: The lowest campsites at the campground in Linn Grove begin to flood.
20.00 ft: Significant flooding of agricultural land begins along this entire stretch of the river. Water begins to flood the lower road at the campground in Linn Grove.
16.50 ft: More substantial flooding of agricultural land as well as the park in Sioux Rapids begins
14.00 ft: Water begins to overtop the lowest banks as well as spill in the lowest areas of the park in Sioux Rapids.
6.48 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Chance of at least minor flooding in October to December: < 5 %.

Rank	Level	Date
1	29.98 ft	June 23, 2024
2	24.13 ft	March 16, 2019
3	23.91 ft	September 22, 2018
4	22.91 ft	June 18, 2014
5	22.85 ft	March 17, 2010
6	22.57 ft	July 17, 2011
7	21.30 ft	March 16, 2007
8	20.94 ft	September 19, 2004
9	20.18 ft	May 2, 2016
10	19.88 ft	June 18, 2001

Weather at the gauge

Rain in the last 3 days: 0.64 in. Rain that falls upstream can take hours or days to show up at a river gauge.

17 Sat 59° 31° – Wind 19 mph

18 Sun 65° 40° – Wind 18 mph

19 Mon 65° 38° – Wind 10 mph

20 Tue 68° 47° – Wind 14 mph

21 Wed 71° 53° 0.22 in Wind 15 mph

22 Thu 74° 55° – Wind 9 mph

23 Fri 76° 59° – Wind 19 mph

Forecast: Open-Meteo

Sunrise 07:42 AM Sunset 06:30 PM Daylight 10 hr, 48 min Waxing gibbous 73%

Map

Other gauges on the Little Sioux River

Gauge	Level	Compared with normal	24 hours	Distance
Little Sioux River at CorrectionvilleRiver gauge, Little Sioux River	5.82 ft	Below flood stage	−0.03 ft	40 mi
Little Sioux River near TurinRiver gauge, Little Sioux River	8.38 ft	Below flood stage	+0.08 ft	74 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Willow Creek near CornellRiver gauge, Willow Creek	82.10 ft	Below flood stage	−0.04 ft	7 mi
Ocheyedan River near SpencerRiver gauge, Ocheyedan River	2.81 ft	Below flood stage	−0.04 ft	16 mi
Des Moines River at EmmetsburgRiver gauge, Des Moines River	1.20 ft	Below flood stage	−0.10 ft	31 mi
Little Floyd River near SanbornRiver gauge, Little Floyd River	83.13 ft	Below flood stage	+0.05 ft	32 mi
West Okoboji Lake at Lakeside Lab near MilfordLake, West Okoboji Lake	4.14 ft	Very high	±0	33 mi
Floyd River at AltonRiver gauge, Floyd River	5.85 ft	Below flood stage	−0.05 ft	39 mi
North Raccoon River near Sac CityRiver gauge, North Raccoon River	480 cfs	High	−71.0 cfs	40 mi
Pilot Creek at County Hwy P15 near RolfeRiver gauge, Pilot Creek	3.59 ft	Very high	−0.22 ft	40 mi

Questions and answers

What is flood stage for the Little Sioux River at Linn Grove?

The official flood stage is 16.50 ft. The level is currently 10.02 ft below it.

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 Little Sioux River at Linn Grove today?

On Oct 20, 2026, 07:00 PM CDT, the water level was 6.48 ft. Down 0.17 ft over the last 24 hours.

Is Little Sioux River at Linn Grove rising or falling?

Down 0.17 ft over the last 24 hours. Up 0.18 ft over the last 7 days.

Is the level of Little Sioux River at Linn Grove normal?

Below flood stage. Judged against the official flood stage for this gauge.

What is the highest water level ever recorded at Little Sioux River at Linn Grove?

The highest level on record is 29.98 ft on June 23, 2024.

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:06605850 (Agency page)
Coordinates: 42.89631, -95.24300 (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

Parameter	Last value	Time (UTC)	Quality
Water level	6.48 ft	2026-10-21 00:00	Provisional
Flow	439 cfs	2026-10-21 00:00	Provisional

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How to cite

U.S. Geological Survey: Little Sioux River at Linn Grove (usgs:06605850). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/iowa/little-sioux-river-at-linn-grove

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.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer