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USGS and Mohave County update model: Kingman subbasin shows large agricultural drawdown, hundred‑year adequacy at risk
Summary
Mohave County and the U.S. Geological Survey presented a 2024 update to the Hualapai (Wallapai) Valley groundwater model showing a substantially larger agricultural withdrawal and a modeled deficit of roughly 50,000 acre‑feet annually in the basin, with the Kingman subbasin most affected.
Mohave County staff and hydrologists from the U.S. Geological Survey presented updated observations and modeling of the Hualapai (sometimes referred to in the presentation as Wallapai) Valley groundwater basin on June 16, reporting that irrigated acreage—particularly in the Kingman subbasin—has increased since the county’s 2019 observations and that modeled annual deficit has grown.
Key findings were summarized by Scott (Development Services) and Jamie Macey of the USGS: aerial and drone surveys in 2024 identified approximately 16,505 acres of irrigated orchards and vines countywide in the basin (an increase concentrated in the Kingman subbasin), producing an estimated agricultural demand of about 44,252 acre‑feet. Combining recharge and withdrawals, staff reported a modeled annual basin deficit of about 50,474 acre‑feet—up from about 30,900…
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