Narrative:

On the river visual 19 to dca we were issued a 'low altitude alert' by reagan tower. We were approximately 4 DME dca at approximately 1;000 feet. The captain immediately leveled off until we joined a 3:1 glide path and landed without incident.after thoroughly debriefing the event; it was determined that two issues contributed to the low altitude:while on the frdmm 3 RNAV arrival; we were issued an unanticipated hold at pldge intersection. After 30 minutes of holding; we were cleared inbound and; almost immediately; were issued a 90 degree vector off course. We declared 'minimum fuel'. When we joined the arrival; the FMGC showed us landing with 50 minutes of fuel. The additional discussion about our fuel state distracted us both from focusing exclusively on the approach.it was the first time that either of us had flown the river visual approach in some time. The approach was conducted at nighttime. Due to these factors; the majority of our time was spent 'outside the aircraft' so as to avoid the prohibited area and locate runway 19. This extra 'outside' time reduced our altitude awareness.

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Original NASA ASRS Text

Title: A319 First Officer reported receiving a low altitude alert from ATC on a night visual approach to DCA.

Narrative: On the River Visual 19 to DCA we were issued a 'low altitude alert' by Reagan Tower. We were approximately 4 DME DCA at approximately 1;000 feet. The Captain immediately leveled off until we joined a 3:1 glide path and landed without incident.After thoroughly debriefing the event; it was determined that two issues contributed to the low altitude:While on the FRDMM 3 RNAV arrival; we were issued an unanticipated hold at PLDGE intersection. After 30 minutes of holding; we were cleared inbound and; almost immediately; were issued a 90 degree vector off course. We declared 'minimum fuel'. When we joined the arrival; the FMGC showed us landing with 50 minutes of fuel. The additional discussion about our fuel state distracted us both from focusing exclusively on the approach.It was the first time that either of us had flown the River Visual approach in some time. The approach was conducted at nighttime. Due to these factors; the majority of our time was spent 'outside the aircraft' so as to avoid the prohibited area and locate Runway 19. This extra 'outside' time reduced our altitude awareness.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.