# Mexican reservoir and dam level fluctuations

> Live situation record from CLSTR: https://clstr.news/situations/mexican-reservoir-and-dam-level-fluctuations
> Updated: 2026-09-22T23:22:48.000Z. Sources: 7. Developments: 2.

Heavy rainfall in Mexico has led to significant fluctuations in reservoir and dam capacities across several states.

In Querétaro, authorities initiated controlled water discharges from dams such as El Carmen to manage levels after the El Carmen dam reached 100% capacity. These measures followed heavy rains on September 8 that caused localized flooding and drainage issues in metropolitan areas, though no injuries were reported.

In other regions, rainfall has bolstered water supplies. In Guanajuato, the Mata and La Esperanza dams are nearing 100% capacity, which officials state will guarantee municipal water supplies for the year. Meanwhile, in Zacatecas, the Leobardo Reynoso dam is at 43% capacity; while lower than earlier in the year, officials indicate the volume is sufficient for the upcoming agricultural cycle despite potential risks from midsummer drought.

## Timeline

### 2026-09-22: Mexican reservoirs see rising water levels following recent rainfall

Rainfall in Mexico has replenished several reservoirs, with dams in Guanajuato nearing full capacity and Zacatecas' Leobardo Reynoso dam at 43%, supporting upcoming agricultural and municipal needs.

5 sources. https://clstr.news/cluster/mexico-reservoir-levels-show-recovery-following-recent-rainfall

### 2026-09-09: Querétaro authorities initiate controlled dam discharges

Authorities in Querétaro, Mexico, have initiated controlled discharges from the El Carmen dam after it reached 100% capacity due to heavy rains and runoff from Guanajuato.

2 sources. https://clstr.news/cluster/quertaro-authorities-initiate-controlled-dam-discharges

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Cite as: Mexican reservoir and dam level fluctuations. CLSTR, https://clstr.news/situations/mexican-reservoir-and-dam-level-fluctuations