Flatiron Reservoir water level

Name: Flatiron Reservoir water level (U.S. Bureau of Reclamation)
Creator: U.S. Bureau of Reclamation
License: https://www.usbr.gov/main/disclaim.html

Reservoir, Colorado, United States

Directions

Normal for mid-October

Surface elevation

5,467.74ft Down 1.98 ft over the last 7 days

Measured Oct 17, 2026 (2 days ago)

Water stored: 513 acre‑ft

History

What this means

The lake level at Flatiron Reservoir reads 5,467.74 ft, about where it usually sits at this time of year.

That puts it 0.97 ft below the median of 5,468.71 ft for mid-October, based on 24 years of readings. A year ago it stood at 5,466.84 ft (+0.90 ft).

It is still going down, by 1.98 ft over the past week. The 30-day range is 5,467.74 ft – 5,471.31 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: 5,468.71 ft0.97 ft below the median for this date
Normal for this date: 5,465.80 ft – 5,470.65 ft8 years in 10 fall in this range (24 years of records)
Same day last year: 5,466.84 ft+0.90 ft
Lowest and highest in 30 days: 5,467.74 ft – 5,471.31 ft
Lowest and highest in 12 months: 5,463.98 ft – 5,471.79 ft

Boating and fishing at Flatiron Reservoir

A lake in its usual range is what most ramps, docks and swimming areas are built for.

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

Weather at the gauge

No rain in the last 3 days.

18 Sun 71° 53° – Wind 13 mph

19 Mon 65° 43° – Wind 11 mph

20 Tue 70° 47° – Wind 8 mph

21 Wed 72° 52° – Wind 11 mph

22 Thu 67° 53° 0.03 in Wind 13 mph

23 Fri 71° 51° – Wind 18 mph

24 Sat 50° 38° – Wind 10 mph

Forecast: Open-Meteo

Sunrise 07:17 AM Sunset 06:16 PM Daylight 11 hr First quarter 55%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Pinewood Reservoir and RattlesnakeReservoir	6,561.57 ft	Low		2.7 mi
Carter Lake ReservoirReservoir	5,709.31 ft	Normal		3.1 mi
Big Thompson River at LovelandRiver gauge, Big Thompson River	0.65 ft	Below flood stage	−0.24 ft	9 mi
Lake Estes and OlympusLake	7,471.29 ft	Normal		13 mi
Marys LakeLake	8,026.37 ft	Very low		16 mi
Horsetooth ReservoirReservoir	5,412.01 ft	Very high		17 mi
Left Hand Creek at Hover Road near LongmontRiver gauge, Left Hand Creek	0.7 cfs	Very low	−0.1 cfs	17 mi
Cache La Poudre River above Boxelder Creek near TimnathRiver gauge, Cache La Poudre River	13.5 cfs	Normal	−5.7 cfs	18 mi

Questions and answers

How does Flatiron Reservoir compare with last year?

It is 0.90 ft higher than on the same day last year, when the reading was 5,466.84 ft.

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

The median for mid-October is 5,468.71 ft. In 8 years out of 10 the reading falls between 5,465.80 ft and 5,470.65 ft, based on 24 years of records.

Is Flatiron Reservoir really 5,467.74 ft deep?

No. 5,467.74 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 17, 2026, the surface elevation was 5,467.74 ft. Down 1.98 ft over the last 7 days.

Is Flatiron Reservoir rising or falling?

Down 1.98 ft over the last 7 days.

Is the level of Flatiron Reservoir normal?

Normal 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

Parameter	Last value	Time (UTC)	Quality
Surface elevation	5,467.74 ft	2026-10-17 06:00	Provisional
Water stored	513 acre‑ft	2026-10-17 06:00	Provisional

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How to cite

U.S. Bureau of Reclamation: Flatiron Reservoir (usbr:331). Accessed October 19, 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.

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