Bat use of roosting boxes installed under flat-bottom bridges in western Oregon

  • Published source details Arnett E.B. & Hayes J.P. (2000) Bat use of roosting boxes installed under flat-bottom bridges in western Oregon. Wildlife Society Bulletin, 28, 890-894.


This study is summarised as evidence for the following.

Action Category

Provide bat boxes for roosting bats

Action Link
Bat Conservation
  1. Provide bat boxes for roosting bats

    A replicated study in 1996–1998 of 15 river bridges in coniferous forest in Oregon, USA (Arnett & Hayes 2000) found that bats used 13 of 15 (87%) bat boxes installed under 15 flat bottom bridges along five large streams. Within a year of installation, 10 boxes were used by bats. Bats were observed day roosting in five different boxes on 14 occasions (all solitary bats except for one group of eight individuals). Guano was collected from traps beneath 12 different boxes on 1–16 occasions. Wooden boxes (60 cm long x 60 cm wide x 30 cm deep) with eight boards placed inside (12 or 19 mm apart) to form crevices were fixed to the underside of the bridges between September 1996 and May 1997. Bridges varied in size (230–475 m width, 11–27 m length, and 3–6 m above the water). Day roosting bats were counted with a spotlight and guano traps were checked during 15 weekly surveys in June–September 1997 and 1998.

    (Summarised by: Anna Berthinussen)

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