Albany reviews two-year pilot of pass‑through bulb‑outs to preserve street trees but warns of maintenance tradeoffs

James Cirelli, a Public Works engineer, presented a two‑year evaluation of pass‑through bulb‑outs installed as a pilot to preserve street trees where roots had damaged curbs. The pilot installations were at 405 Cairns and 805 San Carlos; staff reported improved gutter flow during storms compared with pre‑construction conditions.

"Ultimately these bulb‑outs have achieved the desired objectives," Cirelli said, describing how permeable river rock pads allow water to flow along the gutter line while creating space for roots to grow without damaging the roadway. He emphasized the pilot is not engineered stormwater retention infrastructure but a permeable channeling approach intended to reduce nuisance ponding and avoid tree removal.

Cirelli said real‑world maintenance needs emerged during the test period: sediment and debris accumulation, routine refreshing of cobble pads, and repeated replacement of soft‑hit posts because drivers park over or strike them. He recommended that future installations include full‑time inspection during construction (a service typically budgeted in larger CIP projects) to ensure contractors meet design specifications.

Commissioners questioned the visibility and collision mitigation features, the necessity of posts versus reflective curb painting, and how many other locations could be candidates for the treatment. Staff said site selection will be case‑by‑case; the pilot is a tool in the toolkit rather than an automatic citywide treatment. Neighbors near one pilot site submitted a letter of support; staff reported little negative feedback for the two sites to date.

The commission did not approve a program expansion at this meeting; staff said the pilot data will inform whether the approach is used again and whether maintenance responsibilities and inspection budgets need adjustment.