A great part of William Waters works were houses of worship. Mr. Waters planned twelve and a half churches in Oshkosh that can be documented. Much of the information here in is taken from newspaper accounts. The Oshkosh press always gave more space and detail to projects north of the river and the same held true for religious structures.
One of the first commissions the young architect received upon arriving in Oshkosh was from The Society of St. Peter. The group had outgrown the wooden frame building it occupied on High Street and sought plans from Mr. Waters. In June of 1867 an appeal for sealed bids appeared in the newspaper. The plans called for a frame structure with a brick veneer, 90' x 50'. Later news accounts clam that work had commenced with the laying of a foundation, 63' x 115', then work stalled for several years. It was not until June of 1874 and the arrival of Fr. O'Malley that things got started again with a proposal to receive bids. A newspapers' description in March of 1875 stated that the church would be built that coming season in the French Gothic Style, measuring 112' x 60'; 36' to the eves and 60' to the top of the roof. It was to be a frame structure clad with brick with a steeple 176' tall. Some work was done and by October of that year the old church was abandoned and the parishioners worshiped in the newly completed basement. Once again work stopped, not to resume until July of 1878 when bids were let for the stone and brick work.
After the frequent and devastating fires the city decreed that public building should be built solely of brick or stone. Not until January of 1880 was the church all but finished and the dedication followed , at long last in May. The building served for many years but by the 1950's it looked old and used; years of steam locomotive and factory shoot had sullied the brick, the souring steeple was replaced with a shorter, easier maintained roof. The old church was demolished in 1953 but holds a special place in my heart because I was baptized there, although I recall nothing of the event.
The Katolishers on the south side fared far better than their brethren to the north, by April of 1868 the as yet to be completed church of the Immaculate Conception held its first service. The newspapers gave little coverage to the new south side Catholic Church but to say the ground plan was 98' x 50' and the tower measured 18' x 18'. The structure was probably wooden frame with a brick veneer and was perhaps commissioned at about the same time as St. Peter's Church. The church was not Gothic in style but exhibited Roman arches in the window and front entrance. Buttresses enforced the corners of the nave and the tower as well as the side wall between each of the seven widows. In August of 1868 Fr. Marco became pastor and a month later the name was changed to St. Vincent de Paul. A handsome rectory and school were subsequently constructed. As the years past the church became crowed and out of date the once tall steeple was abbreviated, no doubt for maintenance reasons. The shorter tower gave the church an odd look and by 1914 the congregation replace the old church altogether with an immense new church. 
In 1871 The First Congregational Church occupied a fine if not dated Greek revival style building on Algoma and Bond Streets. In 1872 that building went up in flames and William Waters got the job of planning a replacement; a preliminary front elevation from the archives of the Oshkosh Public Museum appears below.
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The long history of the Episcopal Church is well documented and Mr. Waters played a sizable roll in it. In the mid 1870's Trinity Episcopal served the needs of the faithful in central
Oshkosh; on the south side there was Grace Chapel at Minnesota and Eleventh Streets on the east, Kemper Mission on Winnebago St. near Bowen and the north side St. Paul's Chapel, located on the corner of Melvin and Jefferson Streets. The first St. Paul's Chapel was built in 1872 but was destroyed by fire in 1874, A new St Paul's was designed by Mr. Waters and the press wrote of the first service held there in October of 1875; that it was well attended and praised the decor and windows as being in good taste, credit architect Waters. That building was left in ruins by the cyclone of 1885 and replaced by another Waters designed chapel. As transportation improved in the city the three satellite churches were closed so as to consolidate worship in one venue. There were those who felt the need for another church however and in 1909 Christ Episcopal Church was built on Jackson Street just north of Irving Avenue. The building that was St. Paul's was moved to the new church site and became the guild hall and parlor. Christ Church couldn't make a go of it and the property was taken over in 1917 by Martin Luther Evangelical Church which remained there until building a new structure on Algoma Blvd. The old St. Paul's is still there, used now as housing and looking shabby and in bad repair.