I have received notification from North Lanarkshire Council that the condition of Blackhouse Bridge has deteriorated significantly, and it is now scheduled for demolition. This had been put on hold and the council had commissioned survey work to assess the chances of saving the bridge, however costs were reportedly in the £500,000 bracket. Since then the actions of the winter weather have taken their toll and the bridge is now in a worse condition, the north east wing wall having collapsed. Sadly this is the end for this bridge, a crossing point which has existed for around two hundred years.
NLC hope to salvage some of the stone from the bridge to use in a new crossing, should they decide to install one.
I have contacted NLC and MSP Alex Neil about this, and would hope that they can ensure a new bridge is installed. There are council elections in May, if you do happen to meet any candidates you may want to bring this up. The path could easily be diverted to join up with the North Calder Heritage Trail, at the entrance further up on the A73, towards Brownsburn, keeping a direct pedestrian link from Gartness to Airdrie.