Reservoir · Russia
Ust-Ilimsk Reservoir
Reservoir in Irkutsk Oblast, Russia
- Area
- 1,703km²
- Max depth
- 91m
- Average depth
- 35m
- Elevation
- 291m a.s.l.
- Shoreline
- 1,990km
- Volume
- 59.3km³
Ust-Ilimsk Reservoir is a reservoir in Russia. It covers 1,703 km². On average it is 35 m deep, and 91 m at its deepest point. Its surface lies 291 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Ust-Ilimsk Reservoir?
The water is warmest in August, around 19 °C at the surface, and coldest in January, around 0 °C. It rarely averages 20 °C, but it stays above 17 °C from July to August: brisk, refreshing swimming.
The lake usually freezes over for about 184 days a year, from around 25 October to 26 April.
On the shore, afternoons reach 23 °C on average in July and -20 °C in January. The driest month is February (20 mm of rain), the wettest June (72 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (119 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 | — | -20 | -27 | 24 | 8 | 3.3 | 8 |
| February | Ice | — | -16 | -24 | 20 | 7 | 5.4 | 9 |
| March | Ice | — | -6 | -15 | 28 | 9 | 7.0 | 9 |
| April | Ice | — | 2 | -6 | 37 | 11 | 8.1 | 10 |
| May | 6 | 11 | 12 | 2 | 59 | 14 | 8.0 | 9 |
| June | 14 | 17 | 21 | 11 | 72 | 13 | 9.4 | 7 |
| July | 19 | 20 | 23 | 13 | 72 | 14 | 8.2 | 7 |
| August | 19 | 20 | 20 | 10 | 64 | 13 | 7.0 | 7 |
| September | 14 | 18 | 11 | 3 | 62 | 13 | 4.6 | 8 |
| October | 4 | 10 | 1 | -5 | 48 | 15 | 2.3 | 8 |
| November | Ice | — | -10 | -17 | 38 | 12 | 1.8 | 9 |
| December | Ice | — | -19 | -26 | 28 | 10 | 1.8 | 8 |
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 7 months before flowing out.
- Its catchment drains 782,364 km² of land.
- About 3,438 m³ of water flow out every second, on average.
- Its shoreline is 13.6 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Ust-Ilimsk Reservoir
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
- 1marinas and slipways
- 5ferry piers
- 3viewpoints
- 2hotels, B&Bs and chalets
Taiga
- —fishing spots
- 9restaurants and cafés
Towns on the shore
- Ust’-Ilimsk100,271 people
- Novaya Igirma10,681 people
- Zheleznodorozhnyy7,629 people
- Ust’-Ilimsk
Nearest airport with scheduled flights: Bratsk Airport (BTK), 114 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 | -19.5 | -15.6 | -6.1 | 2.3 | 12.3 | 21.4 | 23.1 | 20.1 | 11.4 | 1.0 | -10.5 | -19.2 |
| 2020 | +6.2 | +3.8 | +1.6 | +6.5 | +2.1 | −0.7 | −0.3 | +2.3 | +1.8 | +0.2 | +2.6 | −0.7 |
| 2021 | −5.0 | −1.7 | −0.3 | −2.2 | −2.1 | −0.4 | +2.6 | +1.8 | −1.2 | +1.2 | +3.6 | −0.1 |
| 2022 | +2.7 | +0.6 | −1.4 | −0.6 | +3.7 | +0.5 | −1.1 | −4.5 | −2.0 | +0.3 | +1.0 | +0.2 |
| 2023 | −1.1 | +2.5 | +1.7 | −4.7 | −1.3 | −1.0 | +0.9 | +1.5 | +3.5 | +3.3 | +0.5 | −1.6 |
| 2024 | +1.1 | −1.0 | +0.5 | +0.2 | +3.1 | −1.3 | +3.4 | +2.1 | −2.1 | −0.4 | +3.3 | +3.8 |
| 2025 | +4.3 | −0.1 | +1.4 | +0.1 | +0.4 | −0.5 | −1.2 | +0.8 | +1.0 | −2.2 | +2.6 | +0.5 |
+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 (Q1973182) · 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.
