# Olza river

Also known as: Olsa, Olše

The Olza (also known as Olsa, Olše) is a European river flowing through Poland. As of 2026-10-16, the Olza was flowing at about 1.479 m³/s at the Dětmarovice gauge.

**Canonical name:** Olza

**Local names / aliases:** Olsa, Olše

**Countries:** Poland

**Maximum upstream drainage area:** 1,119 km²

**Mapped river length:** 35.3 km

**Gauging stations:** 4

**Latest measured discharge:** 1.479 m³/s (Dětmarovice, 2026-10-16)

## Gauging stations on the Olza

The following 4 gauging stations report discharge for the Olza, ordered downstream (largest catchment first). Discharge is in cubic metres per second (m³/s).

| Station | Country | Discharge (m³/s) | Historical Comparison | Observed | Measurement | Data quality | Provider | Lat, Lon | Source |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Dětmarovice | Czech Republic | 1.479 | Much below normal — 70% below the historic median | 2026-10-16 | instantaneous | CHMI operational data | Czech Hydrometeorological Institute | 49.883, 18.487 | [source](https://opendata.chmi.cz/hydrology/) |
| Gołkowice | Poland | 0.55 | Below normal — 49% below the historic median | 2026-10-16 | instantaneous | operational value | IMGW-PIB | 49.926, 18.496 | [source](https://danepubliczne.imgw.pl/api/data/hydro) |
| Łaziska | Poland | 3.93 | Much below normal — 77% below the historic median | 2026-10-16 | instantaneous | operational value | IMGW-PIB | 49.924, 18.443 | [source](https://danepubliczne.imgw.pl/api/data/hydro) |
| Věřňovice | Czech Republic | 3.148 | Much below normal — 59% below the historic median | 2026-10-16 | instantaneous | CHMI operational data | Czech Hydrometeorological Institute | 49.931, 18.419 | [source](https://opendata.chmi.cz/hydrology/) |

## Related rivers

-   [Vistula](/rivers/vistula.html)
-   [Oder](/rivers/oder.html)
-   [Bug](/rivers/bug.html)
-   [Warta](/rivers/warta.html)
-   [Narew](/rivers/narew.html)
-   [Noteć](/rivers/notec.html)
-   [San](/rivers/san.html)
-   [Bug](/rivers/bug-129.html)
-   [Wieprz](/rivers/wieprz.html)
-   [Pilica](/rivers/pilica.html)
-   [Bug](/rivers/bug-130.html)
-   [Bzura](/rivers/bzura.html)

## Data, sources & timestamps

Geometry is the HydroRIVERS network (HydroSHEDS): European reaches with at least 500 km² of upstream catchment, merged into chains between confluences. Flow direction comes from the network itself; river names are the canonical English label joined from provider metadata and Natural Earth, with local-language aliases retained.

Discharge is normalised observed streamflow from official national hydrology providers, measured where a gauge sits on the river and interpolated between gauges. Pale/estimated values are derived from drainage area × the local specific discharge of nearby gauges and are never presented as measurements.

Underlying dataset built 2026-10-16T13:31:53.036165+00:00. This page generated 2026-10-16T13:35:10.972Z. Discharge values carry their own observation dates in the table above.

[Explore the Olza on the interactive map →](/)