Yes!  – a  $92 Million, 700 km high tech surveillance grid is being built on the US border.
The catch?  It’s on the northern border with Canada, and is being put into place by the Canadians …. not the US.
The official rationale for the 700 km of high tech border fence is to stop “cigarette smuggling”.  Along the portion of the border to be initially secured within Ontario and Quebec, there are a number of isolated islands in the St. Lawrence River owned and controlled by independent Native American tribes who are often at odds with the federal Canadian government over issues of sovereignty and taxation.
Interestingly, the funding for this security measure was approved in the fiscal year 2014 Canadian budget, but the mainstream press chose to not report on it in any meaningful way until after the US midterms.

As reported by the National Post:
OTTAWA — A massive intelligence-gathering network of RCMP video cameras, radar, ground sensors, thermal radiation detectors and more will be erected along the U.S.-Canada border in Ontario and Quebec by 2018, the Mounties said Tuesday.
The $92-million surveillance web, formally known as the Border Integrity Technology Enhancement Project, will be concentrated in more than 100 “high-risk” cross-border crime zones spanning 700 kilometres of eastern Canada, said Assistant Commissioner Joe Oliver, the RCMP’s head of technical operations.
“The concept involves employing unattended ground sensors, cameras, radar, licence plate readers, both covert and overt, to detect suspicious activity in high-risk areas along the border,” Assistant Commissioner Oliver told security industry executives attending the SecureTech conference and trade show at Ottawa’s Shaw Centre.
“What we’re hoping to achieve is a reduction in cross-border criminality and enhancement of our national security.”
The network of electronic eyes is to run along the Quebec-Maine border to Morrisburg, Ont., then along the St. Lawrence Seaway, across Lake Ontario, and ending just west of Toronto in Oakville.
The project was announced under the 2014 federal budget, but framed solely as a measure to improve the RCMP’s ability to combat contraband cigarette smuggling.
https://news.nationalpost.com/2014/11/04/rcmp-reveals-details-of-its-92-million-plan-to-erect-a-700-kilometre-electronic-surveillance-shield