Lakes of Bendakaluru

Satellite view: Esri, Maxar, Earthstar Geographics

Ullalu Lake-2

ಉಲ್ಲಾಳು ಕೆರೆ

Also called Ullal Lake

Kere, a large tank, in Ullal ward, Bengaluru West

See it on the map
Size
24.0 acresAbout 14 football pitches
Rank by size
385th largestOf 1,621 lakes that still exist
Valley
Vrishabhavathi
Who looks after it
BDABangalore Development Authority
Water quality
Fit only for irrigationTested Jul 2026
Built over
6% of the lakeSatellite, 2021. The 2018 survey found 0.1% encroached.

Through the years

Nothing on record for 1915 to 1954, 1956 to 1969 and 1974 to 1983.

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

  1. 1914

    Not on the survey map

    See source

  2. 1955

    Not on the U.S. Army map

    Compiled from Survey of India maps of 1945-46

    See source

  3. 1970

    Built

    As the 2018 lake survey records it

    See source

  4. 1973

    On the survey map

    See source

  5. 1984-2021

    Held water most years

    Water in 8% of all satellite passes, 1984-2024

    11% of its water area has since gone dry; 6% 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. 2017-2018

    In the water bodies census, not marked as encroached

    This census's status marks are often wrong

    See source

  7. 2017-2025

    Mostly built on or bare from 2023

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

    See source

  8. 2018

    Still there in the 2018 lake survey

    0.1% encroached, polluted, 24.3 acres surveyed

    Restored, year not recorded

    See source

  9. 2023-2026

    Tested by the state board in 30 months, most often fit only for wildlife and fish

    Jul 2023 to Jul 2026

    See every testSee source

  10. 2025-2026

    Part open water, part dry or built after the monsoon; mostly dry or built in the dry season

    After monsoon, Oct 2025 to Dec 2025

    • 45% open water
    • 25% floating weed
    • 29% dry or built

    Dry season, Mar 2026 to May 2026

    • 0% open water
    • 2% floating weed
    • 98% dry or built
    See source

How big it is

Drawn outline
24.0 acres

About 14 football pitches

See source
2018 lake survey
24.3 acres

About 14 football pitches

See source
End to end
608 m

The longest straight line across the outline

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

How clean the water is

Latest test
Fit only for irrigation

Fit only for irrigation, cooling and waste disposal. Class E on the state board’s scale from A, the cleanest, to E.

Tested Jul 2026

See source
Class each month, tested 30 times since Jul 2023
Fit only for wildlife and fish: 16 months. Fit only for irrigation: 14 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 north-west and north-east

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, orthophosphate, phenolphthalein alkalinity, phosphate, potassium, sulphate

MeasureUnitValue
Water temperature°C25
Dissolved oxygenmg/L1.7
pH6.5
ConductivityµS/cm254
BODmg/L39
Nitratemg/L as N1
Faecal coliformMPN/100mL700
Total coliformMPN/100mL9,200
Bicarbonatemg/L132
TurbidityNTU28.6
Total alkalinitymg/L as CaCO3132
Chloridemg/L16
CODmg/L260
Kjeldahl nitrogenmg/L as N5.6
Ammonia nitrogenmg/L as N4.5
Total hardnessmg/L as CaCO396
Calcium hardnessmg/L as CaCO352
Calciummg/L20.8
Magnesium hardnessmg/L as CaCO344
Magnesiummg/L10.7
Sodiummg/L17
Dissolved solidsmg/L172
Suspended solidsmg/L36
Fluoridemg/L0.32
Sodium share%27
Sodium adsorption ratio0.75

Every month the state board tested it

MonthClassDissolved oxygenmg/LBODmg/LFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
Jul 2026E1.7397009,200See source
Jun 2026E1.3164702,800See source
May 2026E2.8344001,700See source
Mar 2026E7933,00079,000See source
Feb 2026E2.7443402,200See source
Jan 2026D462001,500See source
Dec 2025D5.773103,500See source
Nov 2025D5.8521,00046,000See source
Oct 2025D5.461503,500See source
Sep 2025D5.152101,300See source
Aug 2025D4.981402,400See source
Jul 2025D6.243103,500See source
Jun 2025D642,40017,000See source
May 2025D6.841,5004,800See source
Apr 2025E5217,00049,000See source
Mar 2025E871,70,0004,60,000See source
Feb 2025E2.8161,20017,000See source
Jan 2025D5.971,4007,000See source
Dec 2024D4.281403,500See source
Nov 2024D5.172103,500See source
Oct 2024D7.144,30014,000See source
Sep 2024E1.8201,4007,000See source
Aug 2024D5.242105,400See source
Jul 2024D5.84261,600See source
Jun 2024E181705,400See source
May 2024E2314,00048,000See source
Dec 2023D4.4670,0003,50,000See source
Oct 2023E3.2174,10035,000See source
Sep 2023E3.1164,00035,000See source
Jul 2023E3.21722,0002,40,000See source

Older tests

DateWhereReadingWater temperature°CDissolved oxygenmg/LpHConductivityµS/cmBODmg/LNitrate and nitritemg/L as NFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
2021Ullalu Lake, LakeLowest2526.536930.583,40024,000See source
2021Ullalu Lake, LakeHighest256.37.71,56115256,30,00054,00,000See 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
2017-11-22Inlet24.868.22901403621.1619.64.127550
See source

How much is built over

Built inside the outline
6%

From satellite land cover, 2021

See source
Encroached area, 2017
0.88 acres

Reported by the state legislature’s committee on lake encroachment

See source
Encroached by

Government agencies

See source
Taken for

Road

See source
Where it is encroached

On the west side

See source
Dumped in it

Garbage, construction debris & plastic waste

See source
Land within 500 m

62% built, 16% trees, 12% crops, 9% shrubs, 1% grass

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
Vrishabhavathi

The river basin its water drains to

See source
Water comes from
See source
Overflows into

Muppatu Kavalu Hosa Kere

See source
Catchment
3.1 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, 2 sluice gates, 2 culverts and 2 islands

See source
Used for, 2018 survey

Boating and religious activity

See source
Nearest sewage treatment plant

Mallathahalli Sewage Treatment Plant

1.7 km away, treats 5 million litres a day

See source

What lives here

Birds recorded
129 species

Most seen: Indian Pond-Heron, Red-wattled Lapwing, White-throated Kingfisher, Black Kite and Ashy Prinia.

4,726 sightings, mostly from birdwatchers

See source
All wildlife recorded
132 species

4,729 records, 2016 to 2026

See source
Threatened species seen here
2
  • Spot-billed Pelican near threatened
  • Indian Roller near threatened
See source
Photographed on iNaturalist
74 times

34 species, 57 confirmed by other naturalists.

Most seen: Garganey, Northern Shoveler, White-throated Kingfisher, Indian Golden Oriole and Indian Peafowl.

Last seen May 2026

See source
Animals seen, 2018 survey

Snails, birds, butterflies, dragonflies and reptiles

See source
Water plants, 2018 survey

Emergent

See source
Weed cover, 2018 survey

Partial

See source

Around it

Around it in 2018

Layout

See source

Photos

No photos of it on Wikimedia Commons yet.

Where it is

Ward 16
Ullal

ಉಳ್ಳಾಲ

Bengaluru West corporation, Yeshwanthapura assembly seat

See source
Village
Ullalu

Yeshwanthpura hobli, Bengaluru North taluk, Bengaluru Urban district

See source
Land survey numbers

93

See source
Height above sea level
840 m
See source
Coordinates

12.9613° N, 77.4806° E

See source

Read more

OpenStreetMap
See source
Its number in each record
ATREE lake map
499
2018 lake survey
BUBNYPulu_kr3-232
KGIS tank map
1218
Water bodies census
2/12/002/276600/1302802/001
City lake monitoring site
121