There were. Port : Archangelsk
IIRC I read about at least in Strachan about it.
Esp. that the Entente observers there (Archangelsk) were quite pissed about the conditions :
- lack of fire regulations => quite some explosions of delivered munitions
- lack of a proper railway : there was only a small gauge railway from the actual harbour over the rivever "Northern Dwina" to the "russian normal gauge" railway station some miles away, which also regularly vanished in the mud in spring and summer as well as ice and snow in winter.
- lack of (almost any) organized logistic for getting the goods down south. There were lamentations, that goods delivered in summer 1914 were still there in winter 1915. ... same lamentations also in 1916.
Vladiwostok was available from 1914. ... But the Trans-Sib capacity was not up to the task and it took some time to convince a major supplier to deliver on own risk ... also regarding payment in time : the USA.
(IIRC it were the Brits, who at the beginning enabled the russian to order in the USA by granting sureties]
However, what I don't know is :
tried the germans to interrupt these deliveries ? ... by cruisers, destroyers, subs ?