Lakes of Bendakaluru

Satellite view: Esri, Maxar, Earthstar Geographics

Narasappanahalli Kere

Also called Narasahalli Lake, Narasappanahalli Lake

Kere, a large tank, in Dodda Bidarakallu ward, Bengaluru West

See it on the map
Size
42.7 acresAbout 24 football pitches
Rank by size
210th largestOf 1,621 lakes that still exist
Valley
Arkavathi
Who looks after it
BBMPBruhat Bengaluru Mahanagara Palike
Water quality
Fit only for wildlife and fishTested Jun 2026
Built over
2% of the lakeSatellite land cover, 2021

Through the years

Nothing on record for 1915 to 1949, 1951 to 1954, 1956 to 1973 and 1975 to 1983.

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

  1. 1914

    Not on the survey map

    See source

  2. 1950

    Built

    As the 2018 lake survey records it

    See source

  3. 1955

    On the U.S. Army map

    Compiled from Survey of India maps of 1945-46

    See source

  4. 1974

    On the survey map

    See source

  5. 1984-2021

    Held water every year

    Water in 18% of all satellite passes, 1984-2024

    43% of its water area has since gone dry; 0% 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. 2017-2025

    Mostly plants or weed in most years

    Floating weed shows as crops or grass here, not as water

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

    See source

  7. 2018

    Still there in the 2018 lake survey

    Polluted, 53.6 acres surveyed

    See source

  8. 2023-2026

    Tested by the state board in 29 months, most often fit only for irrigation

    Jul 2023 to Jun 2026

    See every testSee source

  9. 2025-2026

    Mostly dry or built after the monsoon and in the dry season

    After monsoon, Oct 2025 to Dec 2025

    • 2% open water
    • 22% floating weed
    • 76% dry or built

    Dry season, Mar 2026 to May 2026

    • 0.1% open water
    • 19% floating weed
    • 81% dry or built
    See source

How big it is

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

Drawn outline
42.7 acres

About 24 football pitches

See source
Land records
1.50 acres

Smaller than a football pitch

See source
2018 lake survey
53.6 acres

About 30 football pitches

See source
End to end
798 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 Jun 2026

See source
Class each month, tested 29 times since Jul 2023
Fit only for wildlife and fish: 8 months. Fit only for irrigation: 21 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-east

See source
Older tests
4 readings

From 2021

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

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

MeasureUnitValue
Water temperature°C29
Dissolved oxygenmg/L4.8
pH6.7
ConductivityµS/cm1,783
BODmg/L8
Nitratemg/L as N6.2
Faecal coliformMPN/100mL5,800
Total coliformMPN/100mL12,000
Bicarbonatemg/L264
TurbidityNTU21.2
Total alkalinitymg/L as CaCO3264
Chloridemg/L348
CODmg/L92
Ammonia nitrogenmg/L as N0.85
Total hardnessmg/L as CaCO3372
Calcium hardnessmg/L as CaCO3192
Calciummg/L77
Magnesium hardnessmg/L as CaCO3180
Magnesiummg/L44
Sulphatemg/L79
Sodiummg/L162
Dissolved solidsmg/L1,184
Suspended solidsmg/L26
Potassiummg/L20
Fluoridemg/L0.31
Sodium share%47
Sodium adsorption ratio3.7
Orthophosphatemg/L0.37

Every month the state board tested it

MonthClassDissolved oxygenmg/LBODmg/LFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
Jun 2026D4.885,80012,000See source
May 2026E563102,800See source
Apr 2026E5.174902,800See source
Mar 2026D5.144003,500See source
Feb 2026E2.4705803,500See source
Jan 2026E1173,1008,400See source
Dec 2025D4.582702,400See source
Nov 2025E2.7192,20011,000See source
Oct 2025D5.674803,500See source
Sep 2025D74280310See source
Aug 2025E2.9162101,400See source
Feb 2025E1151,7007,900See source
Jan 2025E361,40011,000See source
Dec 2024D4.482604,300See source
Nov 2024E7226,0001,70,000See source
Oct 2024E0.84117,00094,000See source
Sep 2024E283,10011,000See source
Aug 2024E2.8271,4007,900See source
Jun 2024D2.2172,1004,800See source
May 2024E4517,0001,10,000See source
Apr 2024E2214240See source
Mar 2024E1.4284,50,00023,00,000See source
Feb 2024E1.7233,3004,800See source
Jan 2024E3.2143,30014,000See source
Dec 2023D4.3931,0003,50,000See source
Oct 2023E2.1173,30054,000See source
Sep 2023E0.42122,0002,40,000See source
Aug 2023E661,70,00024,00,000See source
Jul 2023E1.1241,70,00024,00,000See source

Older tests

DateWhereReadingWater temperature°CDissolved oxygenmg/LpHConductivityµS/cmBODmg/LNitrate and nitritemg/L as NFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
2021Karihobanahalli Lake, LakeLowest250.36.582731.74,80035,000See source
2021Karihobanahalli Lake, LakeHighest256.17.42,860807.034,80,00,00035,00,00,000See source
2021Narasapura Lake, LakeLowest254.16.954330.33,30024,000See source
2021Narasapura Lake, LakeHighest256.281,021107.751,30,0009,20,000See 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
2017-11-22Inlet23.2246.61,9018.5602773.184182281,600
See source

How much is built over

Built inside the outline
2%

From satellite land cover, 2021

See source
Encroached area, 2017
0.05 acres

Reported by the state legislature’s committee on lake encroachment

See source
Land record maps
See source
Land within 500 m

65% built, 17% crops, 8% trees, 7% shrubs, 3% grass

From satellite land cover, 2021

See source

Who looks after it

Looked after by
Bruhat Bengaluru Mahanagara Palike

BBMP

See source
City work on the lake
To be developed
See source
City zone
Rajarajeshwari Nagar
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
Arkavathi

The river basin its water drains to

See source
Water comes from
See source
Overflows into

Gangondanahalli Kere

See source
Catchment
4.6 km²

The land that drains into it

See source
Fed by, 2018 survey

Rain & drain fed

See source
Built parts, 2018 survey

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

See source
Nearest sewage treatment plant

Nagasandra

2.4 km away, treats 20 million litres a day

See source

What lives here

Birds recorded
57 species

Most seen: Black Kite, Rock Pigeon, Large-billed Crow, Western Swamphen and Common Myna.

442 sightings, mostly from birdwatchers

See source
All wildlife recorded
57 species

442 records, 2021 to 2024

See source
Animals seen, 2018 survey

Birds

See source
Water plants, 2018 survey

Emergent

See source
Weed cover, 2018 survey

Partial

See source

Around it

Around it in 2018

Building, P & factory

See source

Photos

No photos of it on Wikimedia Commons yet.

Where it is

Ward 11
Dodda Bidarakallu

ದೊಡ್ಡ ಬಿದರಕಲ್ಲು

Bengaluru West corporation, Yeshwanthapura assembly seat

See source
Village
Nallakadirenahalli

Yeshwanthpura hobli, Bengaluru North taluk, Bengaluru Urban district

See source
Land survey numbers

40 (Karivabanahalli), 89, 90 (Nelagadiranahalli), 24 (Doddabidarakallu)

See source
Height above sea level
896 m
See source
Coordinates

13.0212° N, 77.4952° E

See source

Read more

OpenStreetMap
See source
Its number in each record
ATREE lake map
259
2018 lake survey
BUBNYPnlk_kr4-196
Lake Development Authority
LDA385
KGIS tank map
1147
City lake monitoring site
224