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Istrouma High School, as seen on March 15, 2017, in Baton Rouge, La.

Advocate staff file photo by HILARY SCHEINUK

Even as their peers returned to work Thursday from summer break, teachers at recently repaired Istrouma High and Glen Oaks Park Elementary schools spent the day elsewhere as they await the green light to occupy their respective buildings.

Teachers at Glen Oaks High came to work Thursday at 6650 Cedar Grove Drive Thursday, but some couldn’t move into their classrooms yet for the same reason.

Thursday was the first day back for East Baton Rouge Parish public school employees. The school system is holding a convocation for all employees Tuesday morning at Southern University.

Students return for the 2017-18 school year on Wednesday.

Glen Oaks High and Glen Oaks Park Elementary flooded 12 months ago. Istrouma High is reopening after being closed for more than three years.

School officials promise that teachers will be able to access all three schools no later than Monday.

Ed Jenkins, program manager with CSRS/Tillage Construction, which oversees most school construction for the parish school system, told the School Board on Thursday that teachers are slated to return to Istrouma High on Friday morning. He said a final state fire marshal’s office inspection is slated for 9 a.m. and he anticipates approval to occupy the building.

Istrouma High teachers, under the direction of new principal Reginald Douglas, spent Thursday at the Florida Boulevard offices of the Louisiana Resource Center for Educators.

The current work at Istrouma, however, is only the first phase of rebuilding the historic high school, which is celebrating 100 years in existence this year. A second phase, renovations to a middle school wing as well as other buildings, is not scheduled for completion until December. And even once that $24.1 million worth of work is done, alumni are trying to find another $3 million-plus to make additional repairs, including to the north Baton Rouge high school’s auditorium.

Glen Oaks Park teachers are slated to return Monday morning to their repaired campus at 5656 Lanier Drive. They too are awaiting final approval from the state fire marshal’s office. After the floods, Glen Oaks Park students and faculty spent the 2016-17 school at the former Banks Elementary, 2401 72nd Ave.

Glen Oaks High was partially ready for teachers Thursday. Superintendent Warren Drake said teachers in the unready buildings are working in the main L building until they get clearance, likely by Monday.

Glen Oaks High students and staff spent the 2017-18 school across town on the campus of Northdale Superintendent’s Academy, 10755 Cletus Drive. The scope of permanent repairs to Glen Oaks High are still being negotiated with FEMA.

Of the other flooded Baton Rouge public schools, Brookstown Middle and Park Forest Elementary are repaired and the teachers are back. Repairs at flooded Park Forest Middle and Twin Oaks Elementary were completed months ago. At least part of the campus of the former Prescott Middle, now Democracy Prep Baton Rouge charter school, has also been back online for months.

Greenbrier Elementary and the former Lanier Elementary, now Celerity Lanier charter school, are the only flooded schools still unrepaired. Their students will spend the 2017-18 school year at the former Howell Park and former Crestworth Middle school campuses, respectively.

Follow Charles Lussier on Twitter, @Charles_Lussier