Alexandria gazette. [volume] (Alexandria, D.C.) 1834-1974, 1922-03-11

Bridge approaching the draw span |
and within four spans thereof,
the draw spans need not De
opened in response to the prescribed
signal until the said train or trans
have passed and the draw spans are
cleared and the draw spans need not
be opened for the passage OF any yes
sci that can safely pass under the
draw spans when closed, unless sad
vessel has in tow vessel which can
not pass under the bridge.
4. That trains, wagons, or other
vehicles shall not be stopped on the
said bridges, or any part thereof, for
the purpose of delaying the operation
OF the draw spans; nor shall vessel
be SO manipulated as to unnecessarily
delay passage through the draw spans
or hinder their operations; but all
passage over, through, or under the
bridges shall be so conducted as TO
prevent unnecessary delay either TO
land or water traffic.
5. That is case the draw spans, or
either of them, can not be opened I'M
mediately when the prescribed signal
is given, on account of failure of the
operating mechanism or for any 9TH
er reason, or in case the opening will
be necessarily delayed the fact shall
be signaled by the tenders or oper-
ators of the bridges to the approach
ing vessel, by prompt display at night
of two red lights, one vertically over
the other, and during the day by the
waving of red flag, or by four short,
rapid blasts. of a steam whistle.
6. That clearance gauges OF type
approved by the Chief Of Engineers
shall be provided and maintained by
the owners of the Railway Bridge, one
on the downstream end of the pivot
pier fender and one on the Potomac
Park sea wall one-half mile below the
bridge; by the owners OF tho highway
Bridge, one on the upstream end OF
pivot-pier fender and one on the Po-
tomac Park sea wall one-halt mile
above the bridge; and an additional
guage for each bridge shall be so
placed that it can be distinctly read
by the operator of the bridge. These
gauges shall be so set and maintained
as to show accurately the actual YER
tical distance between the water sur
face and the lowest point of the lower
chords Of the draw spans.
T. To prevent undue interference
with land traffic, tugs or power boats
habitually using this waterway shall
be entitled to an opening of the draw
span of either bridge only during
the periods Of 10 a. m. to II a. M, to
2 pm. to 3p.m., and SPIN. to q am.
when the gauges described in para
graph read more than 1877 feet.
Provided, howcucr, That when the
gauges above described read less than
| 1877 feet, the bridges shall be opened
for such craft at all hours, except be-
tween 500 a. m and $50 a. m.
s. No vessel shall pass under the
closed draw span Of either bridge at
any time unless the vertical clearance
between the lowest point of said span
and the highest vertical projection OF
! the vessel is at least eighteen (lS)
inches.
Note-The vertical clearance under
the closed draw spans Of the bridges
is PIP feet at mean low water, and
the normal height of the tide at mean
high water is 80 feet above mean low
water.
Owners of tugs and power boats
habitually using this waterway are
advised to reduce the height of their
vessels to 1877 feet in order that they
may pass under or through the bridge
at all times.
9. That between the hours Of 500
a. m. and $50 a. m. of each and every
day the drawbridges shall not be OPP
ened for the passage of any vessel:
Provided, That vessels employed or
controlled by the United States Gov
eminent and by the District of Column
bia shall be passed without delay
through the draws Of said bridges at
any hour of the day or night upon
giving the signal hereinbefore des-
cribed. =,
10. That the owners Of the said
bridges, shall keep a complete record
of of all openings Of the draws in
such form as may be prescribed by
the United States District. Eng1l,
neers, Washington, D. Co. and shall
report to him all cases where the draw
spans have been required to be kept
open for an unreasonable length OF