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Accepted iNat's pretty sure because I don't know. Consider it a starting place. Improvement welcomed.
The location did fit BugGuide's description of the habitat for Oxybelus - along the shore of a river.

Aggregation with mating - about 50 individuals. Maybe Andrena? Multiple iNat observations from this to show a range of behaviors and angles. Emerging from dry dirt in front yard of private property, then hanging out in a rose bush which the owner calls 'the singles bar.'

Large nesting aggregation on a hiking path, bees very active digging. Identified from both female and male specimens; already-dead individuals were collected from the nest sites. Specimens were retained if further photos are needed.