Hmmmm looking at geese listed on Audubon, a Ross's Goose has a migratory path from the Arctic south through Alberta/Saskatchewan and western Montana, then veers rather sharply to the west across Southern Idaho and into the Sacramento Valley where winter range starts. The calls of the birds I saw sound about right (they weren't quite right for Canadian honkers).I've never seen more than 10-12. Probably by the time we get them here they split up along the way. Santa Fe Dam down the road from us is probably their rest-stop.
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False-color satellite image of the San Gabriel River and the Santa Fe Dam.
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Ross's Goose from the Audubon Bird Guide https://www.audubon.org/field-guide/bird/ross's-goose

DH went this last Spring for the RenFaire weekends at the dam & only captured a mated pair of Mallards in the food court... probably searching for food scraps.