Arizona Upland/Eastern Sonoran Mountains

Tanque Verde Creek at Tucson measured 18.9 cubic feet per second on October 20, 2026, the highest recent reading captured in the past month. This follows exceptional September precipitation of 3.4 inches across Pima County, which was 2.2 inches above normal and ranked 3rd wettest September on record, likely sustaining flow in this tributary after the monsoon and early fall storms.

23.41% of Pima County is in severe drought (D2 category) or worse as of 2026-10-19. This level of water stress concentrates contaminants and warms remaining surface water, directly affecting aquatic species habitat and water quality across freshwater ecosystems in the region.

An Amethyst Dancer was recorded on 2026-10-19 near Tucson, Arizona. This threatened damselfly inhabits clear, flowing streams and is sensitive to water quality changes; its presence in multiple locations across Pima County indicates persistent aquatic habitat conditions suitable for this species.

Red-spotted Toad recorded 24 times in the past 30 days, including an observation on 2026-10-17 on Romero Trail in Tucson. The species continues to appear into October, well after the monsoon breeding season ended September 30, indicating sustained dispersal or foraging activity across the landscape.

Western Diamond-backed Rattlesnake recorded 41 times in the past 30 days, with the most recent observation on 2026-10-19 on E Pantano Trail in Tucson. This Threatened species remains active through mid-October as temperatures decline and the species prepares for reduced activity or possible brumation.

Creosote bush is in open flower with ripe fruits on October 17, also showing young leaves and flower buds. In the Sonoran Desert, this species has shifted from primarily spring bloom; the October flowering and fruiting indicate a second opportunistic bout following monsoon rains, now tapering as severe drought in the county has declined from 39.59% to 23.41% between mid-September and mid-October.

Desert willow is at ripe-fruit stage with young and colored leaves on October 17-18, continuing a phenological cycle that began with monsoon moisture. The species uses post-rain periods to mature seeds before the dry season; October leaf coloring signals the transition toward dormancy despite continued fruiting.

Texas barometer bush is in open flower on October 18, with young leaves and flower buds present. This evergreen shrub typically blooms after summer rains in response to moisture availability, and October flowering reflects the monsoon season's tail-end moisture combined with warm temperatures.

A Gila Topminnow was recorded on 2026-08-22 in Pima County. This threatened fish was historically widespread in Arizona but is now restricted to a few managed populations.

Sonoran Desert Tortoise observed 17 times in the past 30 days, including two records on 2026-09-19, all flagged as Threatened. These late-summer sightings coincide with increased surface activity before the tortoise begins its seasonal brumation period.