Watercourse

Olšava

Bodrog and Hornád basinCarpSalmon – trout
fishing districts
3
fishing district length
102km
regions
Prešov Region, Košice Region
  • Carp18,5 km1 fishing district
  • Salmon – trout83,3 km2 fishing districts
Aerial image of watercourse Olšava with the line highlighted
Blue line: course of the watercourse (approximate). Orthophoto mosaic of Slovakia © GKÚ Bratislava, CC BY 4.0Mapy Google

By the water now

Today on the Olšava watercourse

Fishing conditions score, the best window of the day and fishing districts from the best conditions

Average of the watercourse's fishing districts

Low activity · average of 3 fishing districts

The number in the header is an estimate for the middle of the watercourse based on weather and measurements. The average of the fishing districts also counts satellite data, shading and geology of each district.
  • Very high0
  • High0
  • Average0
  • Low3

When the best window ishow many fishing districts have their best two-hour window in a given hour

  1. 00
  2. 06
  3. 12
  4. 18

Most fishing districts have their best window around 15:00.

The score is an estimate of conditions based on weather, water and surroundings, not a bite forecast. Recalculated at 08:04.

Map and fishing districts of the watercourse

The course of the watercourse and its fishing districts. You can switch the line color to today's conditions, quality or any other parameter.

Detailed filtersregion, district, riverbed, depth, shading, satellites, water chemistry and pollution, fish, geology

1445fishing districts
Pick a category to narrow the selection. Next to each option you can see how many fishing districts remain.
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    Water state on the watercourse

    Measurement of water level, temperature and flow, weather by the watercourse and status from satellites

    Water levels on the watercourse

    StanicaStavZmenaTeplota
    Bohdanovce9 cm–
    Source: SHMÚUpdated 7 Nov 2026 07:57

    Elevation profile of the watercourse

    How the watercourse falls downstream: fall, gradient and water speed.

    Brisk watercourse A foothill river with a gravel bottom and a fast current. Grayling and trout already thrive here.

    02004006008000 km20 km40 km60 kmNo. 2OlšavaNo. 1
    Elevation profile of the watercourse: from 603 to 121 m a.s.l. over 66.1 km.
    Fishing districts in order from the highest (left) to the lowest. There may be a section without a fishing district between districts; it is not displayed.
    Highest point
    603 m a.s.l.
    Lowest point
    95 m a.s.l.
    Fall of the fishing districtsFallThe difference in altitude between the upper and lower end of the fishing district in metres. The greater the fall over a shorter length, the faster the water.
    509 m
    Average gradientWatercourse gradientFall per kilometre in per mille (‰, metres per kilometre). Up to 2 ‰ is a slow lowland river, 5 to 10 ‰ a foothill river (grayling, trout), above 10 ‰ a fast stream.
    7,7 ‰
    SinuositySinuosityThe length of the watercourse divided by the straight-line distance between its ends. 1.0 is a straight watercourse; above 1.3 it meanders strongly. Meanders create pools under the banks and shallows in the reaches between.
    1,38

    Source: Open Topo Data (eudem25m), 4 Nov 2026. Gradient and fall are approximate and include only the sections of fishing districts.

    Terén v 3D

    Loading the 3D terrain model…

    Historical images

    Changes in the surroundings and nature from 2019 to 2025: how the banks, vegetation and landscape around the water change. The images switch automatically; you can also browse them by hand.

    Aerial image of watercourse Olšava from 2019
    2019imaged 15 Jun 2019
    Aerial image of watercourse Olšava from 2022
    2022imaged 10 Oct 2022
    Aerial image of watercourse Olšava from 2025
    2025imaged 3 Jul 2025

    Orthophoto mosaic of Slovakia © GKÚ Bratislava, NLC Zvolen. The year and day of imaging depend on the location, so individual years may differ in season and weather.

    Water pollution on the Olšava watercourse

    Water quality according to SHMÚ, wastewater treatment plants near the fishing districts and groundwater nearby

    Surface water near the fishing districtsnearest SHMÚ monitoring site, 2025

    0 of 2 of the watercourse's fishing districts with SHMÚ data have an unmet standard at the nearest site in at least one indicator.

    • No unmet standard2
    • No SHMÚ data1
    SHMÚ has no data for 1 fishing districts: there is no monitoring site with the same name near their watercourse.

    Problem treatment plants near the fishing districts1 treatment plant within 2 km of the fishing district

    • COV Canadoes not meet the requirements (phosphorus)1,8 km

    Groundwater: measured valuestypical value from stations within 10 km, 2025

    2 of 3 fishing districts with measurements have groundwater nearby with a value above the limit for at least one indicator.

    • nitrates 25 to 50 mg/l1
    • harmful substances above the standard at at least one station (metals, pesticides, PFAS, solvents)2
    • ammonium or nitrites above the standard at at least one station1

    Highest nitrates

    Watercourse profile from source to mouthnumber of unmet indicators in 2025 at SHMÚ sites

    01234Boliarov-Nižný Mlyn, rkm 31.4: 2 indicators (2024)Vyšná Myšľa, rkm 6.7: no failed standard (2022)Sačurov, nad, rkm 2.8: 2 indicators (2024)Jasov, rkm 1.1: 3 indicators (2023)ústie, rkm 0.6: no failed standard (2024)ústie, rkm 0.0: 1 indicator (2023)rkm 31 (upper course)rkm 0 (towards the mouth)
    Show sites in the table (6)
    • Boliarov-Nižný Mlynriver km 31.42 indicators
    • Vyšná Myšľariver km 6.7no unmet standard
    • Sačurov, nadriver km 2.82 indicators
    • Jasovriver km 1.13 indicators
    • mouthriver km 0.6no unmet standard
    • mouthriver km 0.01 indicator
    • standard not met
    • no unmet standard
    • site not in the yearbook

    Source: SHMÚ (yearbooks on surface and groundwater quality), the register of wastewater treatment plants from VÚVH and the EEA. A SHMÚ site is assigned to a fishing district by the same watercourse name and by distance; the yearbook lists the sites that failed the standard, so a missing site is not proof of clean water.

    Organizations and location

    Who manages the fishing districts and where they are

    Organizations on the watercoursewho manages the fishing districts and what the conditions are there today

    1. Vranov nad Topľou1 fishing district · 18 km29Olšava29
    2. Košice2 fishing districts · 84 km19Olšava č. 229

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