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Flatiron Reservoir water level

Reservoir, Colorado, United States

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Right now

Very high for mid-October

Surface elevation

5,470.64ft Up 0.07 ft over the last 7 days

Water stored
635 acre‑ft
5,468 5,470

History

History
5,4665,4685,470ftOct 11Oct 12Oct 13Oct 14Oct 165,4665,4685,470ftOct 11Oct 13Oct 16
5,4665,4685,470ftSep 18Sep 25Oct 2Oct 9Oct 165,4665,4685,470ftSep 18Oct 2Oct 16
5,4605,4655,470ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20265,4605,4655,470ftOct 2025Apr 2026Oct 2026
5,4555,4605,4655,470ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20265,4555,4605,4655,470ftNov 2016Oct 2021Oct 2026
5,4555,4605,4655,470ftJanMarMayJulSepNov20265,4555,4605,4655,470ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

At 5,470.64 ft, Flatiron Reservoir is holding more water than usual for mid-October.

That puts it 1.98 ft above the median of 5,468.66 ft for mid-October, based on 24 years of readings. A year ago it stood at 5,465.79 ft (+4.85 ft).

It is on the way up, by 0.07 ft over the past week. The 30-day range is 5,467.88 ft – 5,471.34 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.

Compared with 24 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
5,468.66 ft1.98 ft above the median for this date
Normal for this date
5,465.96 ft – 5,470.51 ft8 years in 10 fall in this range (24 years of records)
Same day last year
5,465.79 ft+4.85 ft
Lowest and highest in 30 days
5,467.88 ft – 5,471.34 ft
Lowest and highest in 12 months
5,463.98 ft – 5,471.79 ft

Boating and fishing at Flatiron Reservoir

When a lake runs high, docks and swimming areas may close for a while and floating logs become a real hazard for boats.

Conditions at the shore change with the level, so check with the agency that runs the lake before a trip.

Weather at the gauge

The forecast is not available right now.

Sunrise 07:14 AM Sunset 06:19 PM Daylight 11 hr, 5 min First quarter 44%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Pinewood Reservoir and RattlesnakeReservoir 6,563.11 ft Low 2.7 mi
Carter Lake ReservoirReservoir 5,709.77 ft Normal 3.1 mi
Big Thompson River at LovelandRiver gauge, Big Thompson River 0.91 ft Below flood stage +0.11 ft 9 mi
Lake Estes and OlympusLake 7,473.34 ft Very high 13 mi
Marys LakeLake 8,025.63 ft Very low 16 mi
Horsetooth ReservoirReservoir 5,411.91 ft Very high 17 mi
Left Hand Creek at Hover Road near LongmontRiver gauge, Left Hand Creek 0.9 cfs Very low +0.1 cfs 17 mi
Cache La Poudre River above Boxelder Creek near TimnathRiver gauge, Cache La Poudre River 19.9 cfs Normal +13.5 cfs 18 mi

Questions and answers

How does Flatiron Reservoir compare with last year?

It is 4.85 ft higher than on the same day last year, when the reading was 5,465.79 ft.

What is a normal level for Flatiron Reservoir in mid-October?

The median for mid-October is 5,468.66 ft. In 8 years out of 10 the reading falls between 5,465.96 ft and 5,470.51 ft, based on 24 years of records.

Is Flatiron Reservoir really 5,470.64 ft deep?

No. 5,470.64 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Flatiron Reservoir today?

On Oct 16, 2026, the surface elevation was 5,470.64 ft. Up 0.07 ft over the last 7 days.

Is Flatiron Reservoir rising or falling?

Up 0.07 ft over the last 7 days.

Is the level of Flatiron Reservoir normal?

Very high for mid-October. Compared with 24 years of daily readings for this time of year.

How often is this data updated?

The U.S. Bureau of Reclamation publishes a new reading once a day. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Bureau of Reclamation
Station code
usbr:331 (Agency page)
Coordinates
40.36500, -105.23610 (WGS84)
Update interval
once a day
Licence
Public domain. Data: U.S. Bureau of Reclamation (RISE), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Surface elevation 5,470.64 ft 2026-10-16 06:00 Provisional
Water stored 635 acre‑ft 2026-10-16 06:00 Provisional

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How to cite

U.S. Bureau of Reclamation: Flatiron Reservoir (usbr:331). Accessed October 17, 2026 via Nivelmap, https://nivelmap.com/en/united-states/colorado/flatiron-reservoir

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.