Bend's rodent ecology is the most distinct in the state. Cross the Cascades and you leave the marine-climate species behind: the Norway rat that owns Portland's combined sewer is rare here, and the roof rat is rarer still. What you get instead is the deer mouse (Peromyscus maniculatus) and the bushy-tailed pack rat (Neotoma cinerea), both of which are adapted to cold, dry winters and to a landscape that hides them well.
The lava-rock problem.
Most of Bend sits on basaltic lava flows from the Newberry Volcano. Below a few feet of soil, the substrate is honeycombed with vesicles, cracks, and small voids — perfect rodent infrastructure. A standard exclusion approach that traces ingress to a single hole in a foundation will not catch what is, in many older Bend houses, a network of paths through the bedrock itself. Effective Bend operators learn to seal the building envelope rather than chase the source.
In a wet-side house you find the hole. In a Bend house, you assume there is no single hole — and seal the whole envelope as if a hundred small ones exist.
The hantavirus question.
The deer mouse is the primary reservoir for Sin Nombre hantavirus in the western United States. The actual incidence of hantavirus pulmonary syndrome in Deschutes County is low — a handful of confirmed cases per decade — but it is not zero, and the risk is real enough that the standard remediation guidance differs from west-side rodent cleanup. Wet droppings with a 10% bleach solution, let dwell 10 minutes, wipe with disposable cloths, never sweep or vacuum dry. This applies in any Bend cleanup.
Building stock notes.
Old Bend (the area around Drake Park and Mirror Pond) is largely pre-1950 housing, with the standard rim-joist and crawl-vent leakage patterns plus the lava-rock overlay. NorthWest Crossing and the newer developments (Tetherow, Brookswood, Sun Lakes) are tight builds — most ingress in those neighborhoods is at the garage-to-house pass-through and the gas service entry. Awbrey Butte is the wildlife corridor: pack rats, deer mice, and the occasional ground squirrel use the juniper-sage edges.
What to do before an operator arrives.
Pull every cardboard box off the garage floor and onto shelving. Pack rats nest in stored material — they will move into a Bend garage in October and stay through March. Walk the exterior and look for "middens" — piles of twigs, scat, and stolen objects (literal pack-rat behaviour) near foundation edges. If you find a midden, treat the whole area, not the pile.