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Register
| Parameter | Value | Source | Date |
|---|
|
name |
Istras |
R.Avotina, Names of Waterbodies Latvian SSR |
01-01-1984 |
|
Municipality (2026) |
Ludzas novads |
the Latvian Parliament |
01-07-2021 |
|
administrative territory (parish or town) |
Istras |
|
01-01-1993 |
|
district (till 01.07.2009) |
Ludzas |
|
01-01-1993 |
|
country |
Latvia |
|
01-01-1993 |
|
status "de jure" Location: lake |
nature reserve |
LR Cab.of Min. |
15-06-1999 |
|
status "de jure" Location: lake |
public |
the Latvian Parliament |
10-06-1998 |
|
area of water surface |
155.3 hectare |
the Latvian Parliament |
10-06-1998 |
|
area of water surface |
155.3 hectare |
LEA |
01-01-1972 |
|
mean depth |
3.1 metre(s) |
SMPI |
01-01-1973 |
|
maximum depth |
5.5 metre(s) |
LEA |
01-01-1972 |
| Parameter | Value | Source | Date |
|---|
|
number of islands |
4 number |
Encyclop.Latv.Nature |
01-01-1995 |
|
total area of islands |
8.851 hectare |
Encyclop.Latv.Nature |
01-01-1995 |
|
name |
Pana (Panu) island |
Latv.Blue&Green Ornament |
01-01-2001 |
|
area of island Location: north |
8.200 hectare |
Encyclop.Latv.Nature |
01-01-1995 |
|
name |
Paberzu island |
Latv.Blue&Green Ornament |
01-01-2001 |
|
area of island Location: center |
0.540 hectare |
Encyclop.Latv.Nature |
01-01-1995 |
|
name |
Liepu island |
Latv.Blue&Green Ornament |
01-01-2001 |
|
area of island Location: west |
0.110 hectare |
Encyclop.Latv.Nature |
01-01-1995 |
|
name |
Maza island |
Latv.Blue&Green Ornament |
01-01-2001 |
|
area of island Location: north-east |
0.001 hectare |
Encyclop.Latv.Nature |
01-01-1995 |
| Parameter | Value | Source | Date |
|---|
|
bottom structure Location: north-west |
mud |
SMPI |
01-01-1973 |
|
bottom structure Location: west |
mud |
SMPI |
01-01-1973 |
|
bottom structure Location: east |
gravel |
SMPI |
01-01-1973 |
|
bottom structure Location: east |
sand |
LEA |
01-01-1972 |
| Parameter | Value | Source | Date |
|---|
|
accessibility of lakeshore |
possible of access |
SMPI |
01-01-1973 |
|
slope angle of lakeshore Location: west |
gentle |
SMPI |
01-01-1973 |
|
slope angle of lakeshore Location: north |
gentle |
SMPI |
01-01-1973 |
|
slope angle of lakeshore Location: south |
steep |
SMPI |
01-01-1973 |
|
slope angle of lakeshore Location: east |
steep |
SMPI |
01-01-1973 |
|
slope angle of lakeshore Location: east |
dip |
LEA |
|
|
slope angle of lakeshore Location: south |
dip |
LEA |
|
|
slope angle of lakeshore Location: west |
low |
LEA |
|
|
slope angle of lakeshore Location: north |
low |
LEA |
|
| Parameter | Value | Source | Date |
|---|
|
inhabitation Location: north-east |
inhabited locality |
Latvian Geospatial Information Agency |
18-09-2007 |
|
inhabitation Location: west |
inhabited locality |
Latvian Geospatial Information Agency |
06-09-2007 |
|
access facilities Location: east |
exist |
"Latvijas ezeri" |
06-08-2004 |
| Parameter | Value | Source | Date |
|---|
|
hydrological regime |
flow-through |
LEA |
|
|
catchment region |
68 (basin of the Velikaya River) |
LEA |
09-01-1998 |
|
count of discharged stream |
3 number |
LEA |
|
| Parameter | Value | Source | Date |
|---|
|
object |
hydraulic structure |
SMPI |
01-01-1973 |
|
object Location: south-west |
notable tree |
|
12-02-2009 |
| Parameter | Value | Source | Date |
|---|
|
colour of water |
brownish |
Nature Census Project |
21-08-2019 |
|
colour of water |
polyhumic |
Nature Census Project |
21-08-2019 |
| Parameter | Value | Source | Date |
|---|
|
fish of natural occurrence Location: lake |
tench |
SMPI |
01-01-1973 |
|
fish of natural occurrence Location: lake |
roach |
SMPI |
01-01-1973 |
|
fish of natural occurrence Location: lake |
perch |
SMPI |
01-01-1973 |
|
fish of natural occurrence Location: lake |
bleak |
SMPI |
01-01-1973 |
|
fish of natural occurrence Location: lake |
pike |
SMPI |
01-01-1973 |
|
fish of natural occurrence Location: lake |
bream |
SMPI |
01-01-1973 |
|
crayfish Location: lake |
little |
SMPI |
01-01-1973 |
| Parameter | Value | Source | Date |
|---|
|
water bloom Location: lake |
scarce |
Nature Census Project |
21-08-2019 |
|
impact |
beaver deed |
Nature Census Project |
21-08-2019 |
|
waste water inlet · (mehāniski attīrītie) |
3 m3 per day |
SMPI |
01-01-1973 |
|
waste water inlet |
mechanical treated |
LEA |
15-12-2004 |