This is more than brilliant excerpt from "BRAJ BHOOMI MOHINI" - http://vishnudut1926.blogspot.ru/2014/07/braj-bhoomi-mohini-english-edition.html
We have already mentioned that Gokul has continued to remain the place of reverence and worship for the followers of Pushti sect.
Shri Yamunāji was the first to give information to Shrimanmahāprabhu (Shree Shreeman Prabhu Vallabha Acharya) - Madhuvaniya ji about the sites by appearing to him in person.
Although Yamunāji is revered in all the sects, but in Pushti sect she is more than just an ordinary body of water.
Her importance lies in her capability to provide the darshan of Shri Krishna to the devotees.Āchārya Mahāprabhu has said in the first shloka of "Shri Yamunāshataka"
नमामि यमुनामहं सकल सिद्धि हेतुं मुदा ।
मुरारि पदपङ्कजस्फुरदमद रेणूत्कटां । ।
namAmi yamunAmahaM sakala siddhi hetuM mudA |
murAri padapa~Nkajasphuradamada reNUtkaTAM | |
तटस्थ नवकानन प्रकट मोद पुष्पाम्बुना ।
सुरासुर सुपूजित स्मरपितुः श्रियं विभ्रतीम् । ।
taTastha navakAnana prakaTa moda puShpAmbunA |
surAsura supUjita smarapituH shriyaM vibhratIm | |
TRANSLATION: "(Body useful for the service of the Lord) The cause of all the siddhis, filled with the continuous dropping of the nectar like bright sand particles from the lotus feet of Murāri ( Shri Krishna), with the water and the manifest joy of the green forests at its bank in the form of flowers , and having the beauty of Shri Krishna, the father of Kāmdev ( Pradyumna) who is worshipped by all Sura-Asura, I joyfully bow to that Yamunā".
Yamunāji is called ‘Sakala Siddhi Hetu’, meaning the one who can fulfill all kinds of wishes.
These wishes or siddhis are not the petty worldly siddhis but such siddhis that help in attaining a divine body that is useful for service and necessary for the attainment of Shri Krishna, siddhis that help in perceiving the Leelās of the Lord, in experiencing and tasting the rasa thereby nourishing and sustaining the sādhaka.
Siddhis that let us drink the nectar flowing from the lotus feet of Shri Krishna, that flood us with its sweetness and give us absorption.
They enable us to taste and perceive the Leelās taking place in the forest groves at her banks between PriyāShri Rādhāand Her bodily manifestations, the gopis and Priyatam Shyām Sundar and even enable us to gain admission in those Leelās.
Yamunāji in Pushti sect is The Deity to be served, as The Chief Queen of Shri Krishna and as Pushti Shakti, She is venerable and worshipable by all.
She is considered as “Krishna Turya Priyā”. She is virājmān as The Fourth Chief Queen in Dwārakā and even in Braj bhāv She is accepted as the Fourth Mistress amongst the Beloveds of Shri Krishna because He sports at Her beautiful banks and immerses in Her waters.
To propitiate Shyām Sundar She assumes His Beautiful Form.
Shyām Sundar said to Priyāji once, “Darling! Whenever you assume mān and sulk, it takes a lot of effort to appease you.”
Priyāji said naturally, “Beloved you assume mān and I will appease you. I want to experience the bliss of doing so.”
Shyām Sundar assumed mān and went and sat in a nikunja.
Shri Rādhā tried all Her means to appease and mollify Him but to no avail.
Even Shri Lalitā, Vishākhā and other Sakhis tried but weren’t successful.
When Shri Yamunāji assumed the form of Shyām Sundar and went before Him, He broke into laughter and was placated.
Priyāji embraced Shri Yamunāji and gave Her the boon that henceforth She will be worshipped in this form and for this reason.
Therefore Yamunāji is virājmān in this form and guides the sādhakas of Pushti sect even today.
Govind ghāt is next to Thakurāni ghāt.