Seismic and Wind

Examples of Eclipse Engineering’s structural design services for BLM towers, Forest Service Lookout Towers, Access Platforms for Military, Goverment and other business sectors.

US Forest Lookout Towers


Eclipse has performed condition assessments for lookout towers throughout the northwestern United States. Assessments included detailed as-built drawings, seismic and wind analysis and material testing to determine the structural integrity of the towers. For example, initial inspection & analysis of existing conditions and retrofit design for a 100’ tall steel lookout tower may include the addition of an observation platform for public viewing.  When the in-depth field inspection showed that there was a combination of member and connection deficiencies as built, the structural design and construction of the retrofit included.

BLM Towers


The 100-foot tall steel observation towers were free climbed and visually inspected to determine the condition and any required repairs for the structures. An extensive code check was provided on the structures with recommendations to bring the structural and safety components up-to-date with current code requirements. Eclipse created a finite element model of the towers to help define the need of retrofit work. One of the tower inspections included the addition of stairs and a viewing platform, designed to be accessible to the public.