Bishop Cosgrove's health started to fail in the early 1900s and he requested a coadjutor bishop.
Once again the cathedral's rector was chosen to be a bishop.
Bishop Davis was the first bishop consecrated in Sacred Heart Cathedral, on November 30, 1904.
He replaced Bishop Cosgrove upon the laters death two years later.

By the end of the first decade of the 20th-century, the parish's boundaries were set.
In 1902 Our Lady of Lourdes was established in Gilbert, present-day Bettendorf, and in 1909 St. Paul the Apostle was founded in Davenport.
The parish's boundaries include some of the poorer sections of the central city as well as some of Davenport's older and wealthier neighborhoods.

Lightning hit the building on August 20, 1928.
The lightning-sparked a fire between the slates of the roof and the ceiling.
This caused extensive smoke and water damage to the church.
Services were held in St. Margaret's Chapel and the school auditorium during the repairs.
The church was repainted in a gothic design.
In order to hide the damage, the woodwork was stained a dark English Oak color.
The ceiling decorations were completed by the Davenport decorating firm of Hartman and Sedding.

Two priests of the Davenport diocese were consecrated as bishop for other dioceses in Sacred Heart Cathedral.
Bishop William Adrian, who spent most of his career at St. Ambrose College, was consecrated for the Diocese of Nashville on April 16, 1936, by Archbishop Amleto Cicognani.
Bishop Maurice Dingman, who held a variety of administrative positions in the diocese, was ordained for the Diocese of Des Moines on June 19, 1968, by Archbishop Luigi Raimondi.
His was one of the first episcopal ordinations celebrated in the vernacular.

Starting in the 1960s the parish implemented a number of changes, which were in line with the reforms of the Second Vatican Council.
In March 1964 a new altar was set up that allowed the priest to face the congregation.
The cathedral was the first church in the Quad Cities to make this change.
The communion rail, pulpit and bishop's throne were removed in 1980.
A new cathedra, or bishop's chair, was placed against the reredos so that he would face the congregation.
The liturgies were celebrated in English instead of Latin.

Social Ministry has been a hallmark of the cathedral parish since the pastorate of Msgr.
Sebastian Menke.
El Centro Cultural Hispano was founded in 1975 to serve the needs of Spanish-speaking people throughout the Quad City area.
Masses in Spanish were celebrated at the cathedral starting in 1977.
The Latino community eventually relocated to St. Joseph's Church in Davenport.
A clothing center that provides free clothes to those in need was established in the cathedral basement, and later a community food pantry was started by the parish.
Sacred Heart was one of the founding churches of Quad Cities Interfaith.
It also started Interfaith Housing, a non-profit corporation to rehab old and rundown houses in the inner city neighborhood.

Extensive renovations were done to the cathedral in the early 1990s.
These renovations were made possible through the result of the generosity of parishioner Elizabeth Kahl-Figge who included the parish in her will.
This included replacing the roof and repainting the interior of the church.
The painting of St. Margaret of Scotland that hung in St. Margaret's Chapel was repaired and hung in the cathedral.
The painting dates to 1873 and is the work of Johann Schmitt.
It was originally hung in the high altar of the old cathedral.
The painting was severely damaged when it was removed from the old church.
It was restored in 1990 at the Intermuseum Laboratory in Oberlin, Ohio.

In the 1990s liturgies celebrated in Vietnamese were added to accommodate the areas growing Vietnamese Community.
A shrine to Our Lady of La Vang was also added to the cathedral grounds in 2004.
Bishop Cosgrove's health started to fail in the early 1900s and he requested a coadjutor bishop. Once again the cathedral's rector was chosen to be a bishop. Bishop Davis was the first bishop consecrated in Sacred Heart Cathedral, on November 30, 1904. He replaced Bishop Cosgrove upon the laters death two years later.
By the end of the first decade of the 20th-century, the parish's boundaries were set. In 1902 Our Lady of Lourdes was established in Gilbert, present-day Bettendorf, and in 1909 St. Paul the Apostle was founded in Davenport. The parish's boundaries include some of the poorer sections of the central city as well as some of Davenport's older and wealthier neighborhoods.
Lightning hit the building on August 20, 1928. The lightning-sparked a fire between the slates of the roof and the ceiling. This caused extensive smoke and water damage to the church. Services were held in St. Margaret's Chapel and the school auditorium during the repairs. The church was repainted in a gothic design. In order to hide the damage, the woodwork was stained a dark English Oak color. The ceiling decorations were completed by the Davenport decorating firm of Hartman and Sedding.
Two priests of the Davenport diocese were consecrated as bishop for other dioceses in Sacred Heart Cathedral. Bishop William Adrian, who spent most of his career at St. Ambrose College, was consecrated for the Diocese of Nashville on April 16, 1936, by Archbishop Amleto Cicognani. Bishop Maurice Dingman, who held a variety of administrative positions in the diocese, was ordained for the Diocese of Des Moines on June 19, 1968, by Archbishop Luigi Raimondi. His was one of the first episcopal ordinations celebrated in the vernacular.
Starting in the 1960s the parish implemented a number of changes, which were in line with the reforms of the Second Vatican Council. In March 1964 a new altar was set up that allowed the priest to face the congregation. The cathedral was the first church in the Quad Cities to make this change. The communion rail, pulpit and bishop's throne were removed in 1980. A new cathedra, or bishop's chair, was placed against the reredos so that he would face the congregation. The liturgies were celebrated in English instead of Latin.
Social Ministry has been a hallmark of the cathedral parish since the pastorate of Msgr. Sebastian Menke. El Centro Cultural Hispano was founded in 1975 to serve the needs of Spanish-speaking people throughout the Quad City area. Masses in Spanish were celebrated at the cathedral starting in 1977. The Latino community eventually relocated to St. Joseph's Church in Davenport. A clothing center that provides free clothes to those in need was established in the cathedral basement, and later a community food pantry was started by the parish. Sacred Heart was one of the founding churches of Quad Cities Interfaith. It also started Interfaith Housing, a non-profit corporation to rehab old and rundown houses in the inner city neighborhood.
Extensive renovations were done to the cathedral in the early 1990s. These renovations were made possible through the result of the generosity of parishioner Elizabeth Kahl-Figge who included the parish in her will. This included replacing the roof and repainting the interior of the church. The painting of St. Margaret of Scotland that hung in St. Margaret's Chapel was repaired and hung in the cathedral. The painting dates to 1873 and is the work of Johann Schmitt. It was originally hung in the high altar of the old cathedral. The painting was severely damaged when it was removed from the old church. It was restored in 1990 at the Intermuseum Laboratory in Oberlin, Ohio.
In the 1990s liturgies celebrated in Vietnamese were added to accommodate the areas growing Vietnamese Community. A shrine to Our Lady of La Vang was also added to the cathedral grounds in 2004.
Sacred Heart Cathedral (Davenport, Iowa)