The flood basins, and the study that recommended them.

Yes. Watershed impairments following fire and monsoonal storms produced severe flooding, which is what prompted Washington County to commission a master plan study in May 2019. The mechanism is the standard one for this country: burned ground upslope no longer absorbs water, so the next serious storm runs straight off it carrying soil and rock down onto whatever sits below, which here is the community on the valley floor.

Four flood and sediment basins, along with flood channels to carry water through the valley rather than across it. That is engineering rather than advice, which is a fair measure of how seriously the flooding was taken. Washington County commissioned the study in May 2019 in response to the flooding that followed fire and monsoon storms.

A study that recommends four basins is not four basins, and a recommendation from 2019 is old enough that the position will have moved. Washington County is the authority and its records are public, so the current state of drainage infrastructure serving any particular part of the valley is a checkable fact rather than a matter of local rumour. Ask the county rather than relying on any summary, including this page.

By removing what holds water on a slope. Vegetation and the organic layer beneath it slow rainfall and let it soak in; strip both off and the same storm runs off the surface instead, gathering speed and picking up soil and rock as it goes. The effect persists for years after a fire, through every monsoon season until the vegetation comes back, which is why the two hazards are really one cycle.

Two things. Where water goes when it comes off the slopes above, and where that puts the specific parcel relative to the path it takes, which is a question about contours and about what is upslope. And what drainage infrastructure has actually been built serving that part of the valley, which is a Washington County records question. Neither is expensive and neither occurs to a buyer arriving from a municipal address.

No, and this is the standard high desert rule with extra force because of the burned ground upslope. A monsoon cell over the hills above can be putting water into a wash while the sky over the valley floor is clear and blue, and a channel that has been dry all year is not a parking space. It is the most common way a visitor or a new resident in this country loses a vehicle.

The Washington County planning commission tabled a conceptual plan for a Dammeron Valley expansion in August 2019. Tabled is the operative word: a conceptual plan that has been tabled is neither approved nor rejected, it is a proposal set aside without a decision. For a buyer it is mainly a reminder that growth pressure reaches this valley too, twenty five minutes from the fastest growing metro in the state.

Washington County, because there is no town government here to do it. That is the recurring theme of buying in an unincorporated community: the questions a buyer would take to a town office elsewhere all go to the county instead, and the answers are public record. In practice it means drainage is nobody's problem locally until the county makes it theirs, which is what the 2019 study was about.

They are the same risk at different points in a cycle rather than two things to rank. The fire creates the conditions for the flooding and the flooding follows for years afterwards, through every monsoon season until vegetation returns. A buyer who has thought about wildfire and not about what comes down the slope afterwards has done half the homework, which is why both pages exist on this companion.