Philomath council approves annexation and rezoning for 602 South 15th, capping development at 16 units

Philomath City Council on Nov. 25 approved the annexation of a 1.59‑acre parcel at 602 South 15th Street and a companion zoning change from low‑density residential (R‑1) to high‑density residential (R‑3) constrained by a development agreement limiting buildout to 16 single‑unit detached houses.

The staff report said the property lies inside the city’s urban growth boundary and that Benton County has determined the site’s private septic system has failed, prompting the owner’s request for annexation to access city sewer and water. Staff concluded the city can provide water, wastewater, storm, park and street services at the assumed maximum density and recommended approval with conditions, including a requirement that a safe pedestrian route to school be constructed within 18 months of annexation or the existing house be demolished.

Neighbors urged the council to reject or delay approval, saying the site floods in heavy events and that added density could worsen winter flooding, parking and safety on South 15th Street. Michael Henthorn, a neighbor, told the council he has lived on South 15th and submitted photographs taken during floods, saying, “I would estimate that water to be about 2 feet deep in that particular flood condition.” Several speakers also questioned sidewalk continuity and whether the neighborhood sidewalks are practically accessible for people with mobility devices.

Applicant Martin Griggs responded that the project team has evaluated floodplain constraints and would follow FEMA guidance and city requirements: “We’re connecting to the sewers so that we’ll repair that concern,” he said, and said homes would be elevated and designed with FEMA‑compatible vents and flow‑through measures to avoid increased downstream flooding.

Staff clarified that floodplain engineering, mitigation and detailed storm‑drain design are reviewed at the site‑design and building permit phase rather than at the annexation stage. The public works analysis cited in the staff report estimated the additional peak water demand for the site at about 0.01 million gallons per day and additional wastewater at about 0.004 MGD and concluded the systems had capacity for the assumed development.

Council deliberations focused on whether the proposal met the annexation and rezoning criteria in the development code and on practical sidewalk accessibility. Councilor Kazi moved to adopt the staff findings and approve the annexation with the recommended conditions; the motion carried. Later the council adopted findings and approved the zone change to R‑3 together with the development agreement that records restrictions against the land, limiting development to the 16 detached units for 15 years.

The development agreement includes site constraints discussed in the staff report (setbacks, maximum heights consistent with neighborhood standards, and wetland preservation strategies). Staff and the applicant said the agreement and the recorded restrictions would bind future owners and that any change would require a return to the council for approval.

The council’s approvals are final for tonight’s meeting; a party dissatisfied with the decision may appeal to the State Land Use Board of Appeals within 21 days. The applicant waived the seven‑day period to submit final written arguments after the record closed.