Lakes of Bendakaluru

Satellite view: Esri, Maxar, Earthstar Geographics

Elenahalli Lake

ಎಲೆನಹಳ್ಳಿ ಕೆರೆ

Also called Yelenahalli Lake

Kere, a large tank, in Yelenahalli ward, Bengaluru South

See it on the map
Size
2.92 acresAbout 1.7 football pitches
Rank by size
1171st largestOf 1,621 lakes that still exist
Valley
Koramangala-Challaghatta
Who looks after it
BDABangalore Development Authority
Water quality
Fit only for wildlife and fishTested Jul 2026
Built over
0.7% of the lakeSatellite, 2021. The 2018 survey found 2% encroached.

Through the years

Nothing on record for 1905 to 1979 and 1981 to 1983.

The records listed below, drawn on one line from 1904 to 2026.

  1. 1904

    Built

    As the 2018 lake survey records it

    See source

  2. 1980

    Not on the survey map

    See source

  3. 1984-2021

    Held water in 7 of 38 years

    Water in 3% of all satellite passes, 1984-2024

    0% of its water area has since gone dry; 17% is new water

    See sourceSee source

  4. 2017-2018

    In the water bodies census, not marked as encroached

    This census's status marks are often wrong

    See source

  5. 2017-2025

    Mostly built on or bare every year

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

    See source

  6. 2018

    Still there in the 2018 lake survey

    2% encroached, polluted, 4.97 acres surveyed

    See source

  7. 2025-2026

    Tested by the state board in 16 months, most often fit only for wildlife and fish

    Apr 2025 to Jul 2026

    See every testSee source

  8. 2025-2026

    Mostly open water after the monsoon and in the dry season

    After monsoon, Oct 2025 to Dec 2025

    • 71% open water
    • 3% floating weed
    • 26% dry or built

    Dry season, Mar 2026 to May 2026

    • 89% open water
    • 2% floating weed
    • 10% dry or built
    See source

How big it is

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

Drawn outline
2.92 acres

About 1.7 football pitches

See source
2018 lake survey
4.97 acres

About 2.8 football pitches

See source
End to end
214 m

The longest straight line across the outline

See source
Deepest point, 2018
3 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 16 times since Apr 2025
Fit only for wildlife and fish: 15 months. Fit only for irrigation: 1 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
Polluted
See source
What pollutes it, 2018

Sewage

See source
Sewage flows in, 2018

From the south-west

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

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

MeasureUnitValue
Water temperature°C26
Dissolved oxygenmg/L5
pH6.5
ConductivityµS/cm584
BODmg/L8
Nitratemg/L as N1.8
Nitritemg/L as N0.09
Faecal coliformMPN/100mL700
Total coliformMPN/100mL3,500
Bicarbonatemg/L176
TurbidityNTU28.4
Total alkalinitymg/L as CaCO3176
Chloridemg/L68
CODmg/L80
Ammonia nitrogenmg/L as N0.4
Total hardnessmg/L as CaCO3116
Calcium hardnessmg/L as CaCO364
Calciummg/L25.6
Magnesium hardnessmg/L as CaCO352
Magnesiummg/L12.6
Sulphatemg/L41
Sodiummg/L64
Dissolved solidsmg/L402
Suspended solidsmg/L38
Phosphatemg/L0.28
Potassiummg/L13
Fluoridemg/L0.26
Sodium share%51
Sodium adsorption ratio2.8
Orthophosphatemg/L0.66

Every month the state board tested it

MonthClassDissolved oxygenmg/LBODmg/LFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
Jul 2026D587003,500See source
Jun 2026D644903,500See source
May 2026D5.954704,300See source
Apr 2026D5.864002,800See source
Mar 2026D4.871,7005,800See source
Feb 2026D5.663302,400See source
Jan 2026D5.461,7007,900See source
Dec 2025D6.442702,400See source
Nov 2025D5.664702,800See source
Oct 2025D5.853302,100See source
Sep 2025D6443540See source
Aug 2025D5.483804,300See source
Jul 2025D5.473104,300See source
Jun 2025D5.852,1007,000See source
May 2025E3.373,3007,900See source
Apr 2025D6.541402,400See 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
2018-01-10Inlet25.2158.13402845131.16.7164.840.411.21,600
2018-01-10Outlet25.7188.235326220207.2160.360.49.81,600
See source

How much is built over

Built inside the outline
0.7%

From satellite land cover, 2021

See source
Encroached area, 2017
0.29 acres

Reported by the state legislature’s committee on lake encroachment

See source
Encroached by

Private owners

See source
Taken for

Layout compound wall

See source
Where it is encroached

On the north-east and south side

See source
Dumped in it

Garbage dump, construction debris, burning waste

See source
Other problems noted

Borewell

See source
Land within 500 m

55% built, 17% crops, 14% trees, 10% grass, 3% shrubs, 2% bare ground

From satellite land cover, 2021

See source

Who looks after it

Looked after by
Bangalore Development Authority

BDA

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
Koramangala-Challaghatta

The river basin its water drains to

See source
Overflows into

Nyanappanahalli Kere

See source
Catchment
0.2 km²

The land that drains into it

See source
Fed by, 2018 survey

Rain & drain fed

See source
Built parts, 2018 survey

3 inlet drains, 1 overflow weir, 1 sluice gate, 1 culvert, no check dams and no islands

See source
Used for, 2018 survey

Cattle feeding

See source
Nearest sewage treatment plant

Hulimavu 10MLD Sewage Treatment Plant

1.1 km away, treats 10 million litres a day

See source

What lives here

Birds recorded
72 species

Most seen: Little Cormorant, Little Grebe, Indian Pond-Heron, Black Kite and Common Myna.

694 sightings, mostly from birdwatchers

See source
All wildlife recorded
73 species

695 records, 2013 to 2024

See source
Photographed on iNaturalist
11 times

11 species, 10 confirmed by other naturalists.

Most seen: Indian Spot-billed Duck, Grey Heron, Eurasian Coot, Eurasian Moorhen and Indian elm.

Last seen Sep 2025

See source
Animals seen, 2018 survey

Birds, butterflies and dragonflies

See source
Water plants, 2018 survey

Emergent and free floating

See source
Weed cover, 2018 survey

Partial

See source

Around it

Around it in 2018

Buildings, layouts, vacant land & rock

See source

Photos

No photos of it on Wikimedia Commons yet.

Where it is

Ward 37
Yelenahalli

ಯೆಲೇನಹಳ್ಳಿ

Bengaluru South corporation, Bangalore South assembly seat

See source
Village
Yelanahalli

Begur hobli, Bengaluru South taluk, Bengaluru Urban district

See source
Land survey numbers

55

See source
Height above sea level
914 m
See source
Coordinates

12.8666° N, 77.6141° E

See source

Read more

OpenStreetMap
See source
Its number in each record
ATREE lake map
117
2018 lake survey
BUBSBGyln_kr2-1515
Lake Development Authority
LDA135
KGIS tank map
1021
Water bodies census
2/12/002/276600/1302864/006
City lake monitoring site
108