I-27o over the Mississippi River Phase I Study - Addendum Madison
County
Exhibit F – IDOT BBS Approval of Hydraulic Report
To: Keith W. Roberts, Dist. 8 Attn: Tiffany Brase
From: D. Carl Puzey By: Patrik D. Claussen
Subject: Hydraulic Report
Date: May 18, 2020
FAI Route 270 P-98-001-15 Section 60B-1 SNs 060-0350 (EB) Madison
County 060-0351 (WB) 060-0035 (Exist.) I-270 over Mississippi River
Reply is made to the April 8, 2020 email from Phil Coppernoll that
details the posting on SharePoint of the revised Hydraulic Report
(HR) provided by Parsons. There are two approved waterway
information tables attached; one is for the construction stage and
one for the final proposed crossing condition. Both tables meet the
zero rise criteria as discussed in a meeting with the Illinois
Department of Natural Resources- Office of Water Resources
(IDNR-OWR) on March 5, 2018. Also attached is a table showing scour
depths and scour depth elevations for all the analyzed flood
frequencies along with a draft version of the GP&E. The
original HR was approved on June 29, 2018 as documented in a memo
from the Bureau of Bridges and Structures to the District office.
An April 24, 2020 document later provided by Parsons upon request
detailed the HR revisions. The following are the changes to the
proposed bridge layout and hydraulic report since June 2018 as
summarized by Parsons: Original (Phase 1) Revised/Current (Phase 2)
Length = 5,383 ft Length = 5,428 ft # Spans = 24 # of Spans = 26
Low Beam = 443.09 ft Low Beam= 444.85 ft Skew = 0 degrees Skew =
varies (all aligned with flow) Pier diameters = 12-ft columns Pier
diameters = 9-ft columns East Abutment = aligned with existing
bridge East Abutment = aligned with flow Additional updates to the
report included: • The SMS model was updated for the proposed
bridge only and results were used
as the input variables for the scour analysis.
• The HEC-RAS model was updated for the proposed bridge and the
PR+EX condition and the model was used to compute backwater
impacts.
• Scour calculations were revised.
• Riprap was sized using HEC-23 DG 4 and placed at the
abutments.
• WIT tables were updated showing very similar results to the Phase
1 tables.
Memorandum
Keith W. Roberts, Dist. 8 / Attn: Tiffany Brase SNs 060-0350EB,
-0351WB, -0035exist. Page 2 May 18, 2020 Abutment riprap was sized
as mentioned above. Please note that a check on the riprap sizing
found that a minimum of A-6 riprap will be needed on the abutments
based upon the design velocity. Also, it is recommended that a
guidebank (or equivalent countermeasure) as suggested in the HR be
installed downstream of the eastern abutment due to the turbulence
shown in the results from the 2D modeling. The Mississippi River is
classified as a Public Water by the IDNR-OWR and an Individual
Permit will be required. Please submit a completed Joint
Application Form along with a final copy of the HR for IDNR-OWR
review. The bridges will meet the IDOT vertical clearance and
freeboard criteria. The proposed structure is subject to refinement
in the proposed phase. If you have any questions or care to
discuss, please contact Neil VanBebber at (217) 785-2917 or
[email protected].
NV/kkt0600350eb0351wb0035e-20200518
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