An iconic Bothell bridge spanning the Sammamish River will be replaced after 36 years of service.

Constructed in 1980, the bridge located at the Park at Bothell Landing has become a city icon and was adopted as the official city logo, but city engineers said the old bridge is facing many structural issues including a decaying deck, cracking support beams and invasive pests. Construction costs were estimated by the city in 2014 at around $1.5 million, although city spokesperson Barbara Ramey said that cost will likely increase.

Plans for a replacement bridge project is to be set some 90 feet to the east, and will have a less severe grade, bringing into compliance with the 1990 Americans with Disabilities Act (ADA), said Jacobs Engineering Group project manager Kevin Kim, who is contracted with the city for the bridge design.

“At this point, we’re doing a lot of research as to what’s best for the area,” Kim said.

The current bridge has a grade of around 14 degrees, much steeper than the five-degree maximum allowed under the ADA.

During an open house held Feb. 24, residents were presented with deck, lighting and rail options for the bridge, with engineers hoping to receive feedback.

According to the city’s comprehensive parks plan, adopted in 2010, the bridge was scheduled to be replaced in 2012. The new bridge will be placed east from its current location, so as not to interfere with the nearby amphitheater at the park.

Bothell’s civil engineer Regina Derda said construction could begin in 2017, if federal grants are approved.

The new bridge will also be a prefabricated bridge, constructed offsite and installed over the river by a crane, Derda said. The current bridge will remain intact during placement of the new one, after which it will be demolished, she said.

Bridge construction comes with a slew of environmental permits, and although the replacement bridge does not involve installing piers in the water, Jacobs Engineering Group environmental planner Maggie Buckley said multiple agencies are involved.

“This one actually has a large number of environmental permits,” she said. “It’s complex because of the number of agencies involved.”

Permits from the Coast Guard, Army Corp. of Engineers, the state Fish and Wildlife department and city permits, among others.

Installation also includes removing shoreline vegetation, which must be replaced at other locations along the river Buckley said.