**Archived extract:** 2026-10-09 (UTC). Frozen data; observation dates are shown as captured. [View the current site](/)

# Kostonjärvi river

The Kostonjärvi is a European river flowing through Finland. As of 2026-10-07, the Kostonjärvi was flowing at about 38.44 m³/s at the Kostonjärvi, pato gauge.

**Canonical name:** Kostonjärvi

**Countries:** Finland

**Maximum upstream drainage area:** 1,775 km²

**Mapped river length:** 50.2 km

**Gauging stations:** 1

**Latest measured discharge:** 38.44 m³/s (Kostonjärvi, pato, 2026-10-07)

## Gauging stations on the Kostonjärvi

The following gauging station reports discharge for the Kostonjärvi. Discharge is in cubic metres per second (m³/s).

| Station | Country | Discharge (m³/s) | Historical Comparison | Observed | Measurement | Data quality | Provider | Lat, Lon | Source |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Kostonjärvi, pato | Finland | 38.44 | Much above normal — 312% above the historic median | 2026-10-07 | daily mean | SYKE flag not supplied | Finnish Environment Institute | 65.75, 28.494 | [source](https://www.syke.fi/en/environmental-data/open-web-services/environmental-data-apis) |

## Related rivers

-   [Vuoksi](/archive/2026-10-09/rivers/vuoksi.html)
-   [Ossauskoski](/archive/2026-10-09/rivers/ossauskoski.html)
-   [Valajaskoski](/archive/2026-10-09/rivers/valajaskoski.html)
-   [Karunki](/archive/2026-10-09/rivers/karunki.html)
-   [Kemijoki](/archive/2026-10-09/rivers/kemijoki.html)
-   [Pirttikoski](/archive/2026-10-09/rivers/pirttikoski.html)
-   [Seitakorva](/archive/2026-10-09/rivers/seitakorva.html)
-   [Piirteenvirta](/archive/2026-10-09/rivers/piirteenvirta.html)
-   [Merikoski](/archive/2026-10-09/rivers/merikoski.html)
-   [Konnivesi](/archive/2026-10-09/rivers/konnivesi.html)
-   [Kokemenjoki](/archive/2026-10-09/rivers/kokemenjoki.html)
-   [Kolsi](/archive/2026-10-09/rivers/kolsi.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 2026-10-09T12:15:16.537822+00:00. This page generated 2026-10-09T12:20:30.802Z. Discharge values carry their own observation dates in the table above.

[Explore the Kostonjärvi on the interactive map →](/archive/2026-10-09/)