Drought whiplash returns to the Cross Timbers

August 21, 2026Northern Cross Timbers

A year ago this week, Oklahoma County's Cross Timbers country carried almost no drought signal at all: barely 5 percent of the county rated even abnormally dry, and none of it fell into an actual drought category.¹ Twelve months on, that picture has inverted. By early October 2025 the entire county sat in at least moderate drought, and by late spring 2026 severe drought covered all of it, with extreme drought at times blanketing the whole county through early April.¹

There was real relief this summer. From late June into early August, severe-drought coverage eased to around 81 percent and extreme drought disappeared entirely.¹ That reprieve didn't hold. Severe drought climbed back to nearly 98 percent of the county by the second week of August and has now returned to covering the entire county in the most recent data, though without the extreme intensity seen last spring.¹

For the oaks, hickories, and understory of the Northern Cross Timbers, this kind of whiplash, wet enough to ease stress, then dry again within weeks, matters more than a single bad season would. These Cross-Timbers savanna-woodland trees are adapted to drought generally, with the thick bark and deep taproots that let post oak stands persist on thin, rocky soils for centuries. But repeated swings between stress and partial recovery leave less margin for root systems, and for the aquatic life in the streams threading through this landscape.

Separately, the Midwest City North wastewater treatment plant was flagged for significant non-compliance under its Clean Water Act permit in this same stretch of county.² EPA records show the matter as an administrative one — resolved, pending, tied to reporting or compliance-schedule requirements rather than a documented pollutant exceedance — and the facility has since returned to compliance. It's a reminder of the regulatory backdrop in a watershed already under drought stress, though not evidence of an active discharge harming water quality right now. The Watershed Sustainability Alliance and the Conservation Coalition of Oklahoma Foundation both do water-stewardship work in this region, and how they respond as drought conditions persist is worth watching.

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Drought in Oklahoma County took a sudden turn for the worse in the past week. Coverage of Severe Drought or worse had held nearly flat, just under 81 percent, for five straight weeks through early August. In the latest reading it jumped to almost 98 percent, a sharp intensification rather than a continuation of that plateau.That shift matters a great deal for this stretch of channel, including the Bricktown Canal reach, which has been in a documented hypoxia episode since mid-July. Dissolved oxygen there had fallen to 2.8 mg/L in 26°C water, a level close to where fish kills start to accelerate. Low flow, reduced aeration, and warm shallow water are the three main drivers of that kind of oxygen stress, and drought deepens all three at once.Fresh dissolved oxygen readings for the stretch were not available this week, so it isn't possible to say directly whether conditions have held steady, eased, or tipped further. But the scale of the drought escalation raises the odds that whatever oxygen stress was already present is being sustained or worsened rather than relieved. This is also the reach downstream of Midwest City's North wastewater treatment plant, which is currently listed in significant non-compliance with its Clean Water Act permit. The specific pollutant and magnitude of that non-compliance aren't known from available records, so it isn't possible to say how, or whether, it's interacting with the canal's oxygen stress — but it's worth keeping in view given how little oxygen margin this stretch already has., , and were all logged along the canal this past week, so the waterway is still drawing wading birds and waterfowl on the surface. Those are presence records only, though, and they say nothing about conditions below the surface, which is where the real risk sits this time of year.

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Drought spikes sharply as canal's oxygen levels go unmeasured

August 6, 2026