Lake · United States
Iliamna Lake
Lake in southwest Alaska
- Area
- 2,635km²
- Max depth
- 301m
- Average depth
- 44m
- Elevation
- 13m a.s.l.
- Shoreline
- 1,007km
- Volume
- 115km³
Iliamna Lake is a lake in United States. It covers 2,635 km². On average it is 44 m deep, and 301 m at its deepest point. Its surface lies 13 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Iliamna Lake?
The water is warmest in August, around 12 °C at the surface, and coldest in January, around 0 °C. Even at its warmest, the surface stays below 17 °C on average: this is cold water.
The lake usually freezes over for about 140 days a year, from around 15 December to 3 May.
On the shore, afternoons reach 17 °C on average in July and -8 °C in January. The driest month is March (50 mm of rain), the wettest September (127 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (124 readings). Shallow bays and beaches are often warmer.
From above
The whole lake from space
Month by month
The year at the lake, month by month
Not a forecast: these are averages over many years. Water is the 2013–2021 average; air, rain, sun and wind are the 1991–2020 average.
Water: 2013–2021 averageClimate: 1991–2020 average
| Month | Water°C | Water high°C | Air high°C | Air low°C | Rainmm | Rainy daysdays | Sunh/day | Windkm/h |
|---|---|---|---|---|---|---|---|---|
| January | Ice | — | -8 | -14 | 64 | 12 | 0.8 | 20 |
| February | Ice | — | -4 | -11 | 61 | 13 | 1.8 | 21 |
| March | Ice | — | -3 | -12 | 50 | 11 | 4.9 | 19 |
| April | Ice | — | 4 | -3 | 59 | 13 | 5.9 | 19 |
| May | 2 | 5 | 10 | 4 | 68 | 16 | 6.9 | 18 |
| June | 8 | 10 | 16 | 8 | 74 | 16 | 7.9 | 16 |
| July | 11 | 12 | 17 | 10 | 103 | 18 | 5.9 | 16 |
| August | 12 | 12 | 16 | 10 | 116 | 18 | 5.0 | 16 |
| September | 11 | 11 | 11 | 5 | 127 | 18 | 4.0 | 18 |
| October | 8 | 10 | 4 | -1 | 101 | 15 | 2.7 | 19 |
| November | 4 | 6 | -4 | -10 | 88 | 14 | 1.3 | 19 |
| December | Ice | — | -6 | -13 | 82 | 15 | 0.3 | 20 |
Water: LakeTEMP (Landsat 8, 2013–2021). Air, rain, sun and wind: NASA POWER, 1991–2020 averages. A rainy day has at least 1 mm of rain. Sunshine hours are derived from measured solar radiation.
Size & depth
How big, how deep
- On average, water stays in the lake for about 10 years before flowing out.
- Its catchment drains 16,869 km² of land.
- About 355 m³ of water flow out every second, on average.
- Its shoreline is 5.5 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Iliamna Lake
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 2beaches and swimming spots
- —campsites
- —boat hire and water-sport clubs
- 2marinas and slipways
- —ferry piers
- —viewpoints
- —hotels, B&Bs and chalets
- —fishing spots
- —restaurants and cafés
Nearest airport with scheduled flights: Iliamna Airport (ILI), 45 km in a straight line.
OpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Recent years
How each month compared
Afternoon high on the shore. The first row is the reference, the 1991–2020 average in °C; the years below show the difference from it: warmer in orange, cooler in blue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | -7.6 | -3.7 | -3.2 | 3.5 | 10.5 | 15.5 | 17.4 | 16.2 | 11.2 | 4.0 | -3.8 | -6.4 |
| 2020 | −11.1 | −2.5 | −0.6 | +0.4 | +1.7 | −0.7 | +1.1 | +1.5 | +0.3 | +0.5 | +0.8 | +2.1 |
| 2021 | +4.0 | −1.4 | −1.0 | −1.7 | +0.1 | −0.7 | −0.1 | −0.7 | −1.9 | −1.7 | −11.3 | +0.3 |
| 2022 | −1.0 | +1.6 | +2.3 | −0.1 | +1.1 | +3.5 | −1.1 | −1.5 | ±0.0 | −0.8 | +1.7 | +1.4 |
| 2023 | +5.1 | −2.8 | +0.2 | −5.5 | −2.9 | −2.4 | −0.3 | +0.1 | −1.6 | −1.0 | +1.6 | −1.0 |
| 2024 | −2.7 | +0.8 | −0.9 | −0.7 | −2.3 | +0.3 | −1.1 | −1.8 | −0.1 | −1.2 | −1.2 | +6.7 |
| 2025 | +5.9 | +2.3 | +3.4 | +0.2 | −0.8 | −1.1 | −0.5 | +0.7 | −0.2 | +1.1 | +1.5 | −7.6 |
+1 warmer than usual −1 cooler than usual
About these numbers
| Outline, area, depth, volume | HydroLAKES v1.0 (Messager et al. 2016) · CC BY 4.0 |
|---|---|
| Water temperature and ice | LakeTEMP v1 (Korver et al. 2024), Landsat 8 2013–2021 · CC BY 4.0 |
| Air, rain, sun, wind | NASA POWER, 1991–2020 · public domain |
| Names and description | Wikidata (Q965436) · CC0 |
| Around the shore | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average or a count from a public dataset. Licences and methods: data sources.
