Calcasieu River Bridge in Lake Charles, La (I-10)

How can people be allowed to drive on this bridge? If something were to happen wouldn't the state and/or federal government be held accountable and negligent for leaving it open to the public? See below from my work, warning us not to take this bridge.

The Calcasieu River Bridge on I-10 has been given a very low safety rating. We urge caution and recommend avoiding this route for any travel, please note that travel on any company business shall be restricted to an alternate route. In most cases, the Lake Charles bypass (I-210) is a viable alternative.
The National Bridge Inventory (NBI) has rated the Calcasieu river bridge a 6.6 out of 100. (That is six point six out of 100, not a typo.)
(FYI - The I-35 West Mississippi River bridge in Minneapolis had a rating of 50 when it collapsed in 2007.)
Opened in 1952 with a 50-year lifespan, the I-10 bridge was designed for 37,000 vehicle crossings per day. An average of 81,710 vehicles crossed the bridge daily in 2016. Please plan on using the I-210 bridge,
to the south of I-10 instead (it has a rating of 73.9).

The National Bridge Inventory Database
State:LA
Place Name: Lake Charles
County: Calcasieu
NBI Structure Number: 071004509127691
Route Sign Prefix: Interstate
Route Number: 10
Facility Carried: ' I0010
Feature Intersected: 'CALCASIEU RIVER RR ST
Location: 'I-10 OVER LA 378
Year Built: 1952
Status: Structurally Deficient
RecordType: Roadway is carried ON the structure
Level of Service: Mainline roadway
Owner: State Highway Agency
Highway Agency District: 07
Maintenance Responsibility: State Highway Agency
Functional Class: Principal Arterial - Interstate, Urban
Service On Bridge: Highway
Service Under Bridge: Highway-waterway-railroad
Latitude: 30 14 13.11 N
Longitude: 93 15 29.94 W
Material Design: Steel continuous
Design Construction: Truss - Thru
Approach Material Design: Steel
Approach Design Construction: Stringer/Multi-beam or Girder
Structure Length (m): 2,014.000
Navigation Vertical Clearance (m): 4.1
Approach Roadway Width (m): 28
Lanes on Structure: 4
Lanes under Structure: 8
Average Daily Traffic: 74100
Year of Average Daily Traffic: 2015
Design Load: MS 18
Scour: Countermeasures have been installed to mitigate an existing problem with scour and to reduce the risk of bridge failure during a flood event.
Bridge Railings: Do not meet currently acceptable standards.
Historical Significance: Bridge is not eligible for the National Register of Historic Places.
# of Spans in Main Structure: 7
# of Spans in Approach Structures: 90
StructureFlared: No flare
Transitions: Does not meet currently acceptable standards.
Approach Guardrail: Does not meet currently acceptable standards.
Approach Guardrail Ends: Meets currently acceptable standards.
Navigation Control: Navigation control on waterway (bridge permit required).
Navigation Horizontal Clearance (m): 11.6
Structure Open?: Open, no restrictions
Deck: Serious Condition
Superstructure: Serious Condition
Substructure: Serious Condition
Structural Evaluation: Basically intolerable requiring high priority of corrective action
Sufficiency Rating (%): 6.6