Lakes of Bendakaluru

Satellite view: Esri, Maxar, Earthstar Geographics

Allasandra Lake

ಅಳ್ಳಾಲಸಂದ್ರ ಕೆರೆ

Also called Allalasandra Lake

Kere, a large tank, in Nyayanga Badavane ward, Bengaluru North

See it on the map
Size
36.4 acresAbout 21 football pitches
Rank by size
247th largestOf 1,621 lakes that still exist
Valley
Hebbal
Who looks after it
BBMPBruhat Bengaluru Mahanagara Palike
Water quality
Fit only for wildlife and fishTested Jul 2026
Built over
0.8% of the lakeSatellite, 2021. The 2018 survey found 5% encroached.

Through the years

Nothing on record for 1915 to 1926, 1928 to 1954, 1956 to 1977 and 1979 to 1983.

The records listed below, drawn on one line from 1914 to 2026.

  1. 1914

    Built

    As the 2018 lake survey records it

    See source

  2. 1927

    On the survey map

    See source

  3. 1955

    On the U.S. Army map

    Compiled from Survey of India maps of 1945-46

    See source

  4. 1978

    On the survey map

    See source

  5. 1984-2021

    Held water most years

    Water in 19% of all satellite passes, 1984-2024

    2% of its water area has since gone dry; 50% is new water

    4 years not counted: the satellite saw under half the lake

    Floating weed looks like dry land to this record, so a weed-covered year can read as dry

    See sourceSee source

  6. 2009

    Restored

    See source

  7. 2017-2018

    In the water bodies census, not marked as encroached

    This census's status marks are often wrong

    See source

  8. 2017-2025

    Mostly water every year

    About three in four of these readings are right, so trust what holds for several years

    See source

  9. 2018

    Still there in the 2018 lake survey

    5% encroached, stp water, 41.6 acres surveyed

    See source

  10. 2023-2026

    Tested by the state board in 35 months, most often fit only for irrigation

    Jul 2023 to Jul 2026

    See every testSee source

  11. 2024

    On the state's list of Bengaluru lakes, looked after by BBMP

    See source

  12. 2025-2026

    Mostly floating weed after the monsoon; mostly open water in the dry season

    After monsoon, Oct 2025 to Dec 2025

    • 0.2% open water
    • 100% floating weed
    • 0% dry or built

    Dry season, Mar 2026 to May 2026

    • 85% open water
    • 12% floating weed
    • 3% dry or built
    See source

How big it is

The records disagree on its size, so each measure is shown.

Drawn outline
36.4 acres

About 21 football pitches

See source
2018 lake survey
41.6 acres

About 24 football pitches

See source
End to end
827 m

The longest straight line across the outline

See source
Deepest point, 2018
5 m
See source
Kind of lake
Kere, a large tank
See source

How clean the water is

Latest test
Fit only for wildlife and fish

Fit only for wildlife and fisheries. Class D on the state board’s scale from A, the cleanest, to E.

Tested Jul 2026

See source
Class each month, tested 35 times since Jul 2023
Fit only for wildlife and fish: 17 months. Fit only for irrigation: 18 months. Every month is listed in the readings below.
Drinkable after disinfection
Fit for bathing
Drinkable after treatment
Fit only for wildlife and fish
Fit only for irrigation
See source
How it looked in 2018
Stp water
See source
What pollutes it, 2018

Sewage

See source
Sewage flows in, 2018

From the north-west

See source
Older tests
2 readings

From 2021

See source
Inlet and outlet tests, 2017-18
1 readings
See source
Every reading
Show every reading

Latest test, Jul 2026. Too low to measure: boron, carbonate, nitrite, phenolphthalein alkalinity, kjeldahl nitrogen

MeasureUnitValue
Water temperature°C26
Dissolved oxygenmg/L4.6
pH7.9
ConductivityµS/cm1,008
BODmg/L4
Nitratemg/L as N3.9
Faecal coliformMPN/100mL840
Total coliformMPN/100mL2,800
Bicarbonatemg/L236
TurbidityNTU10
Total alkalinitymg/L as CaCO3236
Chloridemg/L172
CODmg/L47
Ammonia nitrogenmg/L as N0.42
Total hardnessmg/L as CaCO3272
Calcium hardnessmg/L as CaCO3140
Calciummg/L56
Magnesium hardnessmg/L as CaCO3132
Magnesiummg/L32.1
Sulphatemg/L44
Sodiummg/L98
Dissolved solidsmg/L686
Suspended solidsmg/L18
Phosphatemg/L0.3
Potassiummg/L4
Fluoridemg/L0.28
Sodium share%36
Sodium adsorption ratio2.6
Orthophosphatemg/L0.86

Every month the state board tested it

MonthClassDissolved oxygenmg/LBODmg/LFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
Jul 2026D4.648402,800See source
Jun 2026E393,1008,400See source
May 2026D454702,800See source
Apr 2026E2.7273303,500See source
Mar 2026E1.8425,80012,000See source
Feb 2026E0.5512,2007,900See source
Jan 2026D4.761,7007,900See source
Dec 2025E1.8393,2009,400See source
Nov 2025E1.9251,70013,000See source
Oct 2025D652402,200See source
Sep 2025D5.143305,400See source
Aug 2025D4.172602,800See source
Jul 2025D4.151,4007,900See source
Jun 2025E2.4224304,300See source
May 2025E2.5262,3009,400See source
Apr 2025E2.82321,00070,000See source
Mar 2025D4.641,4004,800See source
Feb 2025E1.2281,3008,400See source
Jan 2025E3.3173,3009,400See source
Dec 2024D6.551502,800See source
Nov 2024D6.373103,500See source
Oct 2024D5.141402,400See source
Sep 2024D6.971,5004,800See source
Aug 2024D4.891703,500See source
Jul 2024D6.6161703,500See source
Jun 2024D7.9252,50021,000See source
May 2024E262,40017,000See source
Mar 2024E3.6322,60017,000See source
Feb 2024D4.5823,00046,000See source
Jan 2024E3.2282,60011,000See source
Dec 2023D5.7440,0003,50,000See source
Oct 2023E3.2204,70054,000See source
Sep 2023E3.21223,0002,40,000See source
Aug 2023E3.2132,70024,000See source
Jul 2023E3.417331,600See source

Older tests

DateWhereReadingWater temperature°CDissolved oxygenmg/LpHConductivityµS/cmBODmg/LNitrate and nitritemg/L as NFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
2021Allasandra Tank, TankLowest2546.542140.96,30054,000See source
2021Allasandra Tank, TankHighest256.48.41,2238.551,10,00,0009,20,00,000See source

Inlet and outlet tests, 2017-18 lake survey

DateWhereWater temperature°CLight transparencycmpHConductivityµS/cmDissolved solidsmg/LSuspended solidsmg/LTurbidityNTUDissolved oxygenmg/LCODmg/LBODmg/LTotal phosphateKjeldahl nitrogenmg/L as NTotal coliformMPN/100mL
2017-11-15Inlet23.438.584452026325.6813.117600
See source

How much is built over

Built inside the outline
0.8%

From satellite land cover, 2021

See source
Encroached area, 2017
4.58 acres

Reported by the state legislature’s committee on lake encroachment

See source
Encroached by

Government agencies

See source
Taken for

Building, road, slum houses, graveyard & vacant land

See source
Where it is encroached

On the north-east and south side

See source
Land within 500 m

64% built, 23% trees, 9% crops, 2% grass, 1% shrubs, 1% bare ground

From satellite land cover, 2021

See source

Who looks after it

Looked after by
Bruhat Bengaluru Mahanagara Palike

BBMP

See source
City lake page

Open its page on the city’s lake monitoring site

See source

Where its water comes from and goes

Valley
Hebbal

The river basin its water drains to

See source
Overflows into

Jakkur Lake

See source
Catchment
4.3 km²

The land that drains into it

See source
Fed by, 2018 survey

Rain & drain

See source
Built parts, 2018 survey

5 inlet drains, 1 overflow weir, no sluice gates, no culverts, no check dams and 2 islands

See source
Used for, 2018 survey

Recreation

See source
Nearest sewage treatment plant

Yelahanka Phase I 10 MLD Sewage Treatment Plant

483 m away, treats 10 million litres a day

See source

What lives here

Birds recorded
127 species

Most seen: Indian Pond-Heron, Rock Pigeon, Gray Heron, Great Cormorant and Black Kite.

7,926 sightings, mostly from birdwatchers

See source
All wildlife recorded
135 species

7,938 records, 2013 to 2026

See source
Threatened species seen here
3
  • Spot-billed Pelican near threatened
  • Indian Roller near threatened
  • River Tern vulnerable
See source
Photographed on iNaturalist
83 times

27 species, 42 confirmed by other naturalists.

Most seen: straggler daisy, Grey Heron, Chequered Keelback, Trailing Daisy and horseweed.

Last seen Aug 2026

See source
Animals seen, 2018 survey

Birds

See source
Water plants, 2018 survey

Emergent

See source

Around it

Around it in 2018

Settlement & apartment

See source

Photos

Allasandra Lake, photographed in 2016
Omkar MK / CC BY-SA 4.0 / Wikimedia Commons, 2016
Allasandra Lake, photographed in 2022
Mythic Society Inscriptions 3D Scanning Project / CC BY-SA 4.0 / Wikimedia Commons, 2022

Where it is

Ward 4
Nyayanga Badavane

ನ್ಯಾಯಾಂಗ ಬಡಾವಣೆ

Bengaluru North corporation, Yelahanka assembly seat

See source
Village
Allalsandra

Yelahanka hobli, Bengaluru North taluk, Bengaluru Urban district

See source
Land survey numbers

15

See source
Height above sea level
923 m
See source
Coordinates

13.0910° N, 77.5868° E

See source

Read more

OpenStreetMap
See source
Its number in each record
ATREE lake map
27
2018 lake survey
BUBNYHals_kr1-236
Lake Development Authority
LDA009
KGIS tank map
737
Water bodies census
2/12/002/253189/025975/001
City lake monitoring site
79