How to read this site

• Drought · <0.4×

  Very low water — pools warm up fast, fish hold in deep refuges. Often a no-fishing call for ethics.

• Low · 0.4–0.7×

  Below the seasonal average. Cleaner sight-fishing but stressed fish — handle with care.

• Normal · 0.7–2.0×

  The river runs around its long-term mean. Most stable window for planning a trip.

• High · 2.0–3.5×

  Above average. Faster current, murkier water — bigger flies, slower presentations.

• Flood · >3.5×

  Spate conditions. River is dangerous to wade; many fisheries close at this level.

• LOW · < 3

  Conditions are working against you — warm/stressed water, low fresh-catch signal or end of season.

• MODERATE · 3 – 5

  Mixed signals. Worth trying if you have the day — focus on dawn / dusk and shaded pools.

• GOOD · 5 – 8

  Most factors aligned — stable flow, decent temperature, fresh catch reports rolling in.

• OPTIMAL · ≥ 8

  Prime window. Clear the calendar — these days are rare.

• C

  Single photo

  A single user-submitted photo with a known location. Click to open the photo card and see the river, date and angler.

• A

  Article

  An article tied to a specific river or place. Click to read — article markers refresh as you pan the map.

• 7

  Cluster

  Multiple items grouped together at the current zoom. The number is how many. Click to zoom in and the cluster will break apart.

Markers re-fetch as you pan or zoom the map — the visible set always matches the current viewport.

• Temperature · °C

  Air temperature 2 m above ground. Colors run from violet (−40 °C) through cyan around freezing to orange at 30 °C.

  -40 °C30 °C

• Clouds · %

  Cloud cover percentage. Transparent over clear skies, denser white as the sky gets overcast (0 — 100 %).

  0 %100 %

• Precipitation · mm/m2

  Rain/snow intensity (mm/m² per hour). Faint yellow for drizzle, deep blue for heavy rain (0 — 140 mm).

  0 mm/m2140 mm/m2

• Wind · km/h

  Wind speed at ground level. Pale pink for calm air, deep purple for gales (1 — 200 km/h).

  1 km/h200 km/h

• Pressure · hPa

  Sea-level atmospheric pressure. Blue = low (storms likely), red = high (stable weather). Range 940 — 1080 hPa.

  940 hPa1080 hPa

On mobile the bar scrolls horizontally — drag or swipe. Edge fades and a first-visit hand-gesture badge hint at this. Each tile's tooltip names the data source — most are SMHI Vattenwebb (flow) or OpenWeather (temperature).

• River length

  410 km

  Total length of the main channel, from source to mouth.

  Source: Wikipedia

• Catchment area

  23 800 km²

  Total land area drained by the river. Larger basins generally mean more stable flow and longer migration corridors.

  Source: Wikipedia

• Long-term average flow

  180 m³/s

  Multi-year mean discharge for this river. Reference for the current Flow value and for the river polyline colour.

  Source: Wikipedia

• Current discharge

  195 m³/s

  Live cubic-meters/sec from the nearest SMHI gauge. Delta = vs the previous observation. Compare to Avg. Flow for context — the river polyline colour visualises this ratio.

  Source: SMHI Vattenwebb

• Water temperature

  12.3 °C

  Live reading from the nearest weather grid point. The delta below shows the change vs the last observation — warmer water = lower oxygen and shorter takes.

  Source: OpenWeather API

• Fishing areas

  7

  Count of distinct fishing areas (Swedish: fiskevårdsområde / FVO) on this river — each is a permit zone with its own rules, pricing and contact. Buy a permit for the area you plan to fish; you can mix several on the same river.

• Flow chart

  Daily discharge in m³/s over the past month or season. The solid line is the observed flow from the nearest SMHI gauge; a dashed segment at the right is the 5-day forecast. The horizontal band marks the long-term average ± typical spread — anything outside is flagged.

  Source: SMHI Vattenwebb

• Temperature chart

  Air temperature at 2m above ground, alongside an overlay pressure line in orange. Coloured fill maps to the OpenWeather temperature scale (see Weather layers above) so cold spells read blue and warm spells read yellow/orange.

  Source: OpenWeather

• Migration counts

  Daily count of fish passing the in-river counter for a migration entity. The total at the top of the chart is the season cumulative — it feeds the Migration Index.

  Source: Vattenfall counters (Sweden)

• Season progression

  Where are we in the salmon run? Percent of the historical 5-year cumulative migration that has arrived by today's day-of-year. Tick marks show the current ISO week and the historical peak week — pre-peak, peak, or post-peak is read off their relative position.

• Hero stats

  Four headline cards: catches reported this season (delta vs last year), fish counted across all counters (delta), rivers in peak conditions (catch_index ≥ 5), and flow regime distribution. The flow regime card stacks rivers into drought / low / normal / high / flood bands and reveals the river names with mini ratio bars on Show.

• Top rivers

  The five highest catch_index rivers for the current season. Each row carries a status pill (LOW · MODERATE · GOOD · OPTIMAL) — same scale as elsewhere on the site.

• Regional activity

  This week's catches grouped by Swedish province, with each region's share of the total and the fish counted at any counters in that region. Quick read of where the heat is concentrated without needing the full map.

• Migration pulse

  The last six weeks of fish counted across all counters. Each bar is colour-coded against the 5-year average for the same ISO week — green above, red below, neutral near average, intensity scales with the size of the gap. A dashed blue line marks the 5-year average; an amber dot marks the actual total from the same week last year.

• River picker

  Pick 2-4 rivers from the chip multi-select. The selection lives in the URL (?r=byskealven&r=morrum…) so the page is share-able and back-button safe.

• Vital stats grid

  Side-by-side rows: length, average flow, current flow + temperature, catch_index now and over the last 30 days, peak migration timing, best historical month, and season open/close dates. Winning value per row is highlighted with a ★ and a ring around the pill.

• Flow indicators

  Current flow shows as a pill colour-coded on the same drought → flood scale used everywhere on the site. A flow-vs-average bar visualises the ratio on a 0-2× scale with a midpoint tick at 1×. A 7-day trend pill points up or down depending on how the river has moved over the last week.

• Peak migration timeline

  Twelve-cell heatmap per river covering Jan-Dec, opacity normalised so each river's relative peaks read clearly. An amber strip marks the historical "best window" — the top months whose cumulative count clears 65% of the year (capped at 3 months).

• Year-over-year chart

  Small-multiples line chart per river: current season as a bold green line with fill, past seasons in fading pastel blue (newest darker). Lets you spot whether this year is tracking ahead or behind historical patterns.

• Trip recommendation

  Pick a date range. The page scores each selected river on conditions inside that window — flow regime, water temperature, migration timing — and ranks them Best · Strong · OK · Skip with a one-line "why".