Mission Bay sidewalks are (still) sinking, creating trip hazards; Drought could make matters worse

Residents of San Francisco’s newer neighborhood around Mission Bay and China Basin say the buildings and sidewalk settlements have caused many unstable sidewalks over the years. However, due to the drought, the clay under the area can be exacerbated by shrinkage.

As you may know, Mission Bay is built on a landfill with a complex of new homes, offices, laboratories, and hospitals. Once a larger bay, it later became a repository after being filled with earth, debris and rubble in the 1906 earthquake and fire. The landscape we know now is only about 10 years old and some buildings were built some time ago. And for at least 10 years, locals say the sidewalks have collapsed, cracked and generally cattywonkus at everyone’s feet.

“You say to yourself, ‘Wow, these are really huge cracks! »», Says resident Jeannette Revel-Mauro. I spoke to KPIX last week.. “We lost on the north side, probably somewhere 3-4 inches.”

The area settles on the clay and mud below, so the building itself is built on top of a pile of concrete, so it’s not always that quiet. But the streets and sidewalks are not on these mountains, so they keep flowing.

As Rachel Gordon of the Public Works Office tells the station, the city is not responsible for the situation as there is a difference between the sidewalks in this part of town and, for example, the sidewalks on Market Street. . city.

“We don’t want to point the finger at someone who says you know you should know, but that’s the situation,” says Gordon.

NOT. Examiner has pictures Includes the current condition of the sidewalk outside a house along Mission Bay Boulevard North. Here, black and yellow warning strips are attached along the edges of the protruding pavers, not horizontal.

In a KPIX article, geoengineer Lawrence Carp explained that the loss of groundwater was likely the cause and was once the Twin Peaks drainage channel. And drought can make the situation worse, but it’s not all clear.

The Millennium Tower sits nearly two miles, but above the mud of the bay. The most important example of a sunken building in San Francisco. The skyscrapers would have had to dig all the way to bedrock to support all the weight. Over the years, the sidewalks around the Millennium Tower have had to be filled in several times and construction is currently underway. $ 100 million in repair This involves supporting an existing foundation with a mountain that descends into the bedrock.

It’s not clear whether climate change and ongoing droughts will continue to make it harder to navigate the sidewalks of Mission Bay, or if the rainy winters will stop flowing for a bit. Some business owners, like Café Riverte (610 Longbridge Street), had to solve the problem on their own. Cafe Riverte has a “Watch Your Feet” sign and a slope that runs from the sidewalk below to the front door.

Resident Linda Hawkins told KPIX that due to security concerns, the city must at least support the situation.

“I have common responsibilities,” Hawkins said. “Do you repeat this over and over again or are you trying to find a longer term solution to not having to redo all the sidewalks every 10 years?” “

According to Gordon, this is not the only problem with sidewalks, and there is still a policy that sidewalks are the responsibility of the building owner.

“If I repair the sidewalks in Mission Bay, will I be asked to repair the sidewalks in Mission, the Richmond District and North Beach?” Gordon said.

Photo: Alfred Toe

Mission Bay sidewalks are (still) sinking, creating trip hazards; Drought could make matters worse Mission Bay sidewalks are (still) sinking, creating trip hazards; Drought could make matters worse