Foix river · Catalan Inland Basins · dam built in 1928 · official record 1988-2011.
Foix no longer appears in the weekly hydrological bulletin. Its last published reading is from 1 March 2011. The bulletin only covers mainland reservoirs above 5 hm³ of capacity, and at 4 hm³ this pool falls below that threshold, so it was dropped.
What remains is the record: 1,209 weekly readings between 5 January 1988 and 1 March 2011, averaging 86.8 % full. It is a closed series, which is why this page shows no "today" figure — showing one would mean inventing it. What follows describes how it behaved while it was tracked.
Blue line: average monthly filling across the whole record, from 1988. The dot marks the last published reading, 0.0 % in March.
With 1,209 weekly readings since 1988, the average pattern of Foix is clear: it peaks in January at 91.0 % and bottoms out in August at 75.7 %. That 15-point range makes it a reservoir with a moderate annual swing.
The highest reading in the whole series is 100.0 %, on 5 January 1988, and the lowest 0.0 %, on 15 February 2011. Comparing today against those two extremes says more than the bare percentage: 50 % is good news in a pool that rarely tops 60 %, and bad news in one that is usually full.
The figures on this page come from the official MITECO reservoir archive, the same database behind Spain’s weekly hydrological bulletin. The bulletin covers every mainland reservoir above 5 hm³ of capacity and is published every Tuesday with Monday’s reading.
The latest reading here is from 1 March 2011, and the comparison series starts in 1988. Nothing is estimated, interpolated or forecast: the percentage is stored volume divided by the usable capacity the bulletin itself assigns to the dam. Historical averages are computed over the same calendar week in every previous year, the only fair comparison in a system with such marked seasonality.
See the whole demarcation, with all 7 dams the bulletin tracks: Catalan Inland Basins.
