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

# Hartolankoski river

The Hartolankoski is a European river flowing through Finland. As of 2026-10-07, the Hartolankoski was flowing at about 148.9 m³/s at the Hartolankoski gauge.

**Canonical name:** Hartolankoski

**Countries:** Finland

**Maximum upstream drainage area:** 20,371 km²

**Mapped river length:** 59.8 km

**Gauging stations:** 2

**Latest measured discharge:** 148.9 m³/s (Hartolankoski, 2026-10-07)

## Gauging stations on the Hartolankoski

The following 2 gauging stations report discharge for the Hartolankoski, 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 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Hartolankoski | Finland | 148.9 | Normal — 46% above the historic median | 2026-10-07 | daily mean | SYKE flag not supplied | Finnish Environment Institute | 61.328, 22.85 | [source](https://www.syke.fi/en/environmental-data/open-web-services/environmental-data-apis) |
| Äetsä | Finland | 114.2 | Normal — 20% above the historic median | 2026-10-07 | daily mean | SYKE flag not supplied | Finnish Environment Institute | 61.279, 22.699 | [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 Hartolankoski on the interactive map →](/archive/2026-10-09/)